diff --git a/app/components/ClearStorageModal.vue b/app/components/ClearStorageModal.vue
new file mode 100644
index 0000000..0d88a0f
--- /dev/null
+++ b/app/components/ClearStorageModal.vue
@@ -0,0 +1,159 @@
+<script setup lang="ts">
+const props = defineProps<{
+  open: boolean
+}>()
+
+const emit = defineEmits<{
+  'update:open': [value: boolean]
+  'cleared': []
+}>()
+
+const { t } = useI18n()
+const toast = useToast()
+const step = ref<'warning' | 'confirm'>('warning')
+const confirmation = ref('')
+const clearing = ref(false)
+
+const canConfirm = computed(() =>
+  !clearing.value && confirmation.value.trim() === t('storage.clearStoragePhrase')
+)
+
+watch(() => props.open, (open) => {
+  if (open) {
+    step.value = 'warning'
+    confirmation.value = ''
+    clearing.value = false
+  }
+})
+
+function close() {
+  if (clearing.value) return
+  emit('update:open', false)
+}
+
+function goToConfirm() {
+  step.value = 'confirm'
+}
+
+function clearBrowserCache() {
+  const keys = [
+    'pichost.upload-preferences',
+    'pichost.upload-preferences.video',
+    'pichost.upload-preferences.file',
+    'pichost.recent-tag-ids',
+    'pichost.library-view.image',
+    'pichost.library-view.video',
+    'pichost.library-view.file'
+  ]
+  for (const key of keys) localStorage.removeItem(key)
+}
+
+async function confirmClear() {
+  if (!canConfirm.value) return
+  clearing.value = true
+  try {
+    const result = await $fetch<{
+      deletedMedia: number
+      deletedObjects: number
+      clearedCacheDirs: number
+      failed: Array<{ key: string }>
+    }>('/api/user/storage/purge', {
+      method: 'POST',
+      credentials: 'include',
+      body: { confirmation: confirmation.value.trim() }
+    })
+
+    clearBrowserCache()
+    emit('cleared')
+
+    if (result.failed.length) {
+      toast.add({
+        title: t('storage.clearStoragePartial', {
+          failed: result.failed.length,
+          total: result.deletedMedia + result.failed.length
+        }),
+        color: 'warning'
+      })
+    } else {
+      toast.add({
+        title: t('storage.clearStorageSuccess', {
+          files: result.deletedObjects,
+          cache: result.clearedCacheDirs
+        }),
+        color: 'success'
+      })
+    }
+    emit('update:open', false)
+  } catch (error: unknown) {
+    const message = error && typeof error === 'object' && 'data' in error
+      ? (error as { data?: { error?: { message?: string } } }).data?.error?.message
+      : undefined
+    toast.add({
+      title: message || t('storage.clearStorageFailed'),
+      color: 'error'
+    })
+  } finally {
+    clearing.value = false
+  }
+}
+</script>
+
+<template>
+  <UModal
+    :open="open"
+    :title="step === 'warning' ? t('storage.clearStorageTitle') : t('storage.clearStorageFinalTitle')"
+    @update:open="emit('update:open', $event)"
+  >
+    <template #body>
+      <template v-if="step === 'warning'">
+        <UAlert
+          color="error"
+          variant="subtle"
+          icon="i-lucide-octagon-alert"
+          :description="t('storage.clearStorageWarning')"
+        />
+        <p class="mt-3 text-sm text-muted">
+          {{ t('storage.clearStorageScope') }}
+        </p>
+      </template>
+
+      <template v-else>
+        <p class="text-sm leading-6 text-muted">
+          {{ t('storage.clearStorageInstruction') }}
+        </p>
+        <UInput
+          v-model="confirmation"
+          class="mt-3 w-full"
+          :placeholder="t('storage.clearStoragePlaceholder')"
+          autofocus
+        />
+      </template>
+    </template>
+
+    <template #footer>
+      <div class="flex w-full justify-end gap-2">
+        <UButton
+          :label="t('common.cancel')"
+          color="neutral"
+          variant="outline"
+          :disabled="clearing"
+          @click="close"
+        />
+        <UButton
+          v-if="step === 'warning'"
+          :label="t('common.continue')"
+          color="error"
+          @click="goToConfirm"
+        />
+        <UButton
+          v-else
+          :label="t('storage.clearStorageConfirm')"
+          color="error"
+          :loading="clearing"
+          :disabled="!canConfirm"
+          @click="confirmClear"
+        />
+      </div>
+    </template>
+  </UModal>
+</template>
diff --git a/app/components/HlsDownloadModal.vue b/app/components/HlsDownloadModal.vue
new file mode 100644
index 0000000..44226df
--- /dev/null
+++ b/app/components/HlsDownloadModal.vue
@@ -0,0 +1,100 @@
+<script setup lang="ts">
+import type { FileItem } from '~/types/file'
+
+const props = defineProps<{
+  open: boolean
+  item: FileItem | null
+}>()
+
+const emit = defineEmits<{
+  'update:open': [value: boolean]
+}>()
+
+const { t } = useI18n()
+const toast = useToast()
+const downloading = ref(false)
+
+watch(() => props.open, (open) => {
+  if (!open) downloading.value = false
+})
+
+async function confirmDownload() {
+  const item = props.item
+  if (!item?.hlsKey || downloading.value) return
+
+  downloading.value = true
+  try {
+    const response = await fetch('/api/files/hls-mp4', {
+      method: 'POST',
+      credentials: 'include',
+      headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify({ key: item.key })
+    })
+
+    if (!response.ok) {
+      const payload = await response.json().catch(() => null) as {
+        error?: { message?: string }
+      } | null
+      throw new Error(payload?.error?.message || t('library.video.downloadMp4Failed'))
+    }
+
+    const blob = await response.blob()
+    const objectUrl = URL.createObjectURL(blob)
+    const dot = item.originalName.lastIndexOf('.')
+    const filename = `${dot > 0 ? item.originalName.slice(0, dot) : item.originalName}.mp4`
+    const link = document.createElement('a')
+    link.href = objectUrl
+    link.download = filename
+    document.body.appendChild(link)
+    link.click()
+    link.remove()
+    setTimeout(() => URL.revokeObjectURL(objectUrl), 0)
+    emit('update:open', false)
+  } catch (error) {
+    toast.add({
+      title: error instanceof Error ? error.message : t('library.video.downloadMp4Failed'),
+      color: 'error'
+    })
+  } finally {
+    downloading.value = false
+  }
+}
+</script>
+
+<template>
+  <UModal
+    :open="open && !!item"
+    :title="t('library.video.downloadMp4Title')"
+    @update:open="emit('update:open', $event)"
+  >
+    <template #body>
+      <p class="text-sm leading-6 text-muted">
+        {{ t('library.video.downloadMp4Confirm') }}
+      </p>
+      <p
+        v-if="downloading"
+        class="mt-3 text-sm text-primary"
+      >
+        {{ t('library.video.downloadMp4Working') }}
+      </p>
+    </template>
+
+    <template #footer>
+      <div class="flex w-full justify-end gap-2">
+        <UButton
+          :label="t('common.cancel')"
+          color="neutral"
+          variant="outline"
+          :disabled="downloading"
+          @click="emit('update:open', false)"
+        />
+        <UButton
+          :label="t('common.continue')"
+          color="primary"
+          :loading="downloading"
+          @click="confirmDownload"
+        />
+      </div>
+    </template>
+  </UModal>
+</template>
diff --git a/app/components/MediaSessionCard.vue b/app/components/MediaSessionCard.vue
index 8a924ae..62054e4 100644
--- a/app/components/MediaSessionCard.vue
+++ b/app/components/MediaSessionCard.vue
@@ -17,6 +17,7 @@ const emit = defineEmits<{
 
 const { formatFileSize } = useFileSize()
 const { t, locale } = useI18n()
+const transcodeFailureLabel = useTranscodeFailureLabel()
 const { copyFormat } = useUploadPreferences(props.kind)
 
 const copyFormatItems = computed(() => [
@@ -102,22 +103,11 @@ const presetLabel = computed(() => {
 <template>
   <div class="flex flex-col overflow-hidden rounded-xl border border-default bg-elevated shadow-sm">
     <div class="relative aspect-video shrink-0 overflow-hidden bg-muted">
-      <img
-        v-if="kind === 'video' && item.thumbUrl"
+      <VideoThumbnail
+        v-if="kind === 'video'"
         :src="thumbLink"
         :alt="item.originalName"
-        loading="lazy"
-        class="size-full object-cover"
-      >
-      <div
-        v-else-if="kind === 'video'"
-        class="flex size-full items-center justify-center"
-      >
-        <UIcon
-          name="i-lucide-film"
-          class="size-10 text-dimmed"
-        />
-      </div>
+      />
       <div
         v-else
         class="flex size-full items-center justify-center"
@@ -174,9 +164,10 @@ const presetLabel = computed(() => {
           color="error"
           variant="subtle"
           size="xs"
-          class="shrink-0"
+          class="max-w-48 shrink-0 truncate"
+          :title="transcodeFailureLabel(item.transcodeError)"
         >
-          {{ t('library.transcodeFailed') }}
+          {{ transcodeFailureLabel(item.transcodeError) }}
         </UBadge>
         <UBadge
           v-else-if="item.hlsUrl"
diff --git a/app/components/VideoCard.vue b/app/components/VideoCard.vue
index 7fe07f2..f7730bc 100644
--- a/app/components/VideoCard.vue
+++ b/app/components/VideoCard.vue
@@ -16,11 +16,13 @@ const props = defineProps<{
 const emit = defineEmits<{
   'play': []
   'delete': []
+  'download': []
   'update:selected': [value: boolean]
 }>()
 
 const { formatFileSize } = useFileSize()
 const { t, locale } = useI18n()
+const transcodeFailureLabel = useTranscodeFailureLabel()
 
 /** 转码完成后按 HLS 播放列表展示 */
 const displayName = computed(() => {
@@ -37,34 +39,15 @@ const uploadedLabel = computed(() => {
     return props.item.uploadedAt
   }
 })
-
-const thumbFailed = ref(false)
-
-watch(() => props.item.thumbUrl, () => {
-  thumbFailed.value = false
-})
 </script>
 
 <template>
   <div class="flex flex-col overflow-hidden rounded-xl border border-default bg-elevated">
     <div class="relative aspect-video shrink-0 overflow-hidden bg-muted">
-      <img
-        v-if="item.thumbUrl && !thumbFailed"
+      <VideoThumbnail
         :src="thumbLink"
         :alt="displayName"
-        loading="lazy"
-        class="size-full object-cover object-center"
-        @error="thumbFailed = true"
-      >
-      <div
-        v-else
-        class="flex size-full items-center justify-center"
-      >
-        <UIcon
-          name="i-lucide-film"
-          class="size-10 text-dimmed"
-        />
-      </div>
+      />
 
       <button
         type="button"
@@ -108,8 +91,10 @@ watch(() => props.item.thumbUrl, () => {
           color="error"
           variant="solid"
           size="xs"
+          class="max-w-48 truncate"
+          :title="transcodeFailureLabel(item.transcodeError)"
         >
-          {{ t('library.transcodeFailed') }}
+          {{ transcodeFailureLabel(item.transcodeError) }}
         </UBadge>
       </div>
     </div>
@@ -162,6 +147,15 @@ watch(() => props.item.thumbUrl, () => {
         rel="noopener"
         :aria-label="t('files.download')"
       />
+      <UButton
+        v-else-if="item.hlsUrl"
+        icon="i-lucide-download"
+        variant="ghost"
+        color="neutral"
+        size="sm"
+        :aria-label="t('library.video.downloadMp4')"
+        @click="emit('download')"
+      />
       <UButton
         icon="i-lucide-trash-2"
         variant="ghost"
diff --git a/app/components/VideoLibraryPanel.vue b/app/components/VideoLibraryPanel.vue
index 5354410..e6c9e49 100644
--- a/app/components/VideoLibraryPanel.vue
+++ b/app/components/VideoLibraryPanel.vue
@@ -7,6 +7,7 @@ const { isAuthenticated, handleAuthError } = useAuth()
 const toast = useToast()
 const { t, locale } = useI18n()
 const { items: tagItems, fetchTags, batchUpdateTags } = useTags()
+const transcodeFailureLabel = useTranscodeFailureLabel()
 
 const items = ref<FileItem[]>([])
 const total = ref(0)
@@ -27,6 +28,8 @@ const deleteTargetKeys = ref<string[]>([])
 const deleting = ref(false)
 const previewOpen = ref(false)
 const previewItem = ref<FileItem | null>(null)
+const downloadOpen = ref(false)
+const downloadItem = ref<FileItem | null>(null)
 
 const currentBackend = ref('all')
 const currentSource = ref('all')
@@ -66,7 +69,7 @@ function videoLink(item: FileItem): string {
 }
 
 function thumbLink(item: FileItem): string {
-  return withToken(item.thumbUrl)
+  return withToken(item.thumbUrl) || '/video-placeholder.svg'
 }
 
 function downloadUrl(item: FileItem): string {
@@ -264,6 +267,13 @@ function openPreview(item: FileItem) {
   previewOpen.value = true
 }
 
+function requestDownload(item: FileItem | null) {
+  if (!item?.hlsUrl) return
+  previewOpen.value = false
+  downloadItem.value = item
+  downloadOpen.value = true
+}
+
 onMounted(() => {
   void loadBackendOptions()
 })
@@ -514,6 +524,7 @@ defineExpose({ refresh })
           :selected="selectedKeys.has(item.key)"
           @update:selected="toggleSelected(item.key, $event)"
           @play="openPreview(item)"
+          @download="requestDownload(item)"
           @delete="requestDelete(item)"
         />
       </div>
@@ -577,17 +588,9 @@ defineExpose({ refresh })
                       :aria-label="t('library.play')"
                       @click="openPreview(item)"
                     >
-                      <img
-                        v-if="item.thumbUrl"
+                      <VideoThumbnail
                         :src="thumbLink(item)"
                         :alt="displayName(item)"
-                        loading="lazy"
-                        class="size-full object-cover"
-                      >
-                      <UIcon
-                        v-else
-                        name="i-lucide-film"
-                        class="size-5 text-dimmed"
                       />
                     </button>
                     <p
@@ -611,8 +614,9 @@ defineExpose({ refresh })
                       variant="subtle"
                       size="xs"
                       class="shrink-0"
+                      :title="transcodeFailureLabel(item.transcodeError)"
                     >
-                      {{ t('library.transcodeFailed') }}
+                      {{ transcodeFailureLabel(item.transcodeError) }}
                     </UBadge>
                   </div>
                 </td>
@@ -695,6 +699,15 @@ defineExpose({ refresh })
                       rel="noopener"
                       :aria-label="t('files.download')"
                     />
+                    <UButton
+                      v-else-if="item.hlsUrl"
+                      size="xs"
+                      variant="ghost"
+                      color="neutral"
+                      icon="i-lucide-download"
+                      :aria-label="t('library.video.downloadMp4')"
+                      @click="requestDownload(item)"
+                    />
                     <UButton
                       size="xs"
                       variant="ghost"
@@ -746,7 +759,13 @@ defineExpose({ refresh })
       :thumb-link="previewItem ? thumbLink(previewItem) : ''"
       :download-link="previewItem ? downloadUrl(previewItem) : ''"
       :deleting="deleting"
+      @download="requestDownload(previewItem)"
       @delete="previewItem && requestDelete(previewItem)"
     />
+
+    <HlsDownloadModal
+      v-model:open="downloadOpen"
+      :item="downloadItem"
+    />
   </div>
 </template>
diff --git a/app/components/VideoPreviewModal.vue b/app/components/VideoPreviewModal.vue
index bcd7f30..a090855 100644
--- a/app/components/VideoPreviewModal.vue
+++ b/app/components/VideoPreviewModal.vue
@@ -20,11 +20,13 @@ const props = withDefaults(defineProps<{
 const emit = defineEmits<{
   'update:open': [value: boolean]
   'delete': []
+  'download': []
 }>()
 
 const toast = useToast()
 const { formatFileSize } = useFileSize()
 const { t, locale } = useI18n()
+const transcodeFailureLabel = useTranscodeFailureLabel()
 const { copyFormat } = useUploadPreferences('video')
 
 const videoEl = ref<HTMLVideoElement | null>(null)
@@ -80,7 +82,7 @@ const transcodeLabel = computed(() => {
     case 'done':
       return t('library.video.transcodeDone')
     case 'failed':
-      return t('library.transcodeFailed')
+      return transcodeFailureLabel(item.transcodeError)
     default:
       return t('library.video.transcodeNone')
   }
@@ -498,6 +500,15 @@ function downloadOriginal() {
           size="sm"
           @click="downloadOriginal"
         />
+        <UButton
+          v-else-if="item.hlsUrl"
+          :label="t('library.video.downloadMp4')"
+          icon="i-lucide-download"
+          color="neutral"
+          variant="outline"
+          size="sm"
+          @click="emit('download')"
+        />
         <UButton
           :label="t('image.previewCopyLink')"
           icon="i-lucide-link"
diff --git a/app/components/VideoThumbnail.vue b/app/components/VideoThumbnail.vue
new file mode 100644
index 0000000..59b49cc
--- /dev/null
+++ b/app/components/VideoThumbnail.vue
@@ -0,0 +1,30 @@
+<script setup lang="ts">
+const props = defineProps<{
+  src?: string
+  alt: string
+}>()
+
+const failed = ref(false)
+
+watch(() => props.src, () => {
+  failed.value = false
+})
+</script>
+
+<template>
+  <img
+    v-if="src && !failed"
+    :src="src"
+    :alt="alt"
+    loading="lazy"
+    class="size-full object-cover object-center"
+    @error="failed = true"
+  >
+  <img
+    v-else
+    src="/video-placeholder.svg"
+    :alt="alt"
+    loading="lazy"
+    class="size-full object-cover object-center"
+  >
+</template>
diff --git a/app/components/api/ApiDebugger.vue b/app/components/api/ApiDebugger.vue
index 6dbd49f..3c54635 100644
--- a/app/components/api/ApiDebugger.vue
+++ b/app/components/api/ApiDebugger.vue
@@ -65,8 +65,14 @@ function resetForm() {
     if (!isDebugParam(param)) continue
     if (param.type === 'file') {
       files[param.name] = null
+    } else if (param.name === 'kind') {
+      values[param.name] = props.endpoint.category === 'video' ? 'video' : 'file'
     } else if (param.name === 'keys') {
-      values[param.name] = '["images/2026/08/example.webp"]'
+      values[param.name] = props.endpoint.category === 'video'
+        ? '["videos/2026/10/example.mp4"]'
+        : props.endpoint.category === 'file'
+          ? '["files/2026/10/example.pdf"]'
+          : '["images/2026/08/example.webp"]'
     } else if (param.name === 'token' && props.token) {
       values[param.name] = props.token
     } else {
@@ -84,6 +90,12 @@ function fileLabel(name: string) {
   return fileValues.value[name]?.name ?? t('api.debug.noFileSelected')
 }
 
+function fileAccept() {
+  if (props.endpoint.category === 'video') return 'video/*'
+  if (props.endpoint.category === 'file') return undefined
+  return 'image/*'
+}
+
 function triggerFilePick(name: string) {
   fileInputRefs.value[name]?.click()
 }
@@ -101,8 +113,8 @@ function isParamFilled(param: ApiDocParam) {
   if (!value) return false
   if (param.location === 'body' && param.name === 'keys') {
     try {
-      const parsed = JSON.parse(value) as { keys?: unknown }
-      return Array.isArray(parsed.keys) && parsed.keys.length > 0
+      const parsed = JSON.parse(value) as unknown
+      return Array.isArray(parsed) && parsed.length > 0
     } catch {
       return false
     }
@@ -159,7 +171,14 @@ async function sendRequest() {
     } else if (debugBodyParams.value.some(p => p.location === 'body')) {
       headers['Content-Type'] = 'application/json'
       try {
-        body = JSON.stringify(JSON.parse(paramValues.value.keys || '{}'))
+        const payload: Record<string, unknown> = {}
+        for (const param of debugBodyParams.value) {
+          if (param.location !== 'body') continue
+          const value = paramValues.value[param.name]?.trim()
+          if (!value) continue
+          payload[param.name] = param.name === 'keys' ? JSON.parse(value) : value
+        }
+        body = JSON.stringify(payload)
       } catch {
         toast.add({ title: t('api.debug.invalidJson'), color: 'error' })
         sending.value = false
@@ -297,7 +316,7 @@ const responseScrollable = computed(() => responseBody.value.split('\n').length
                 <input
                   :ref="(el) => { fileInputRefs[param.name] = el as HTMLInputElement }"
                   type="file"
-                  accept="image/*"
+                  :accept="fileAccept()"
                   class="hidden"
                   @change="onFileChange(param.name, $event)"
                 >
diff --git a/app/components/api/ApiSidebar.vue b/app/components/api/ApiSidebar.vue
index f759bb2..876189e 100644
--- a/app/components/api/ApiSidebar.vue
+++ b/app/components/api/ApiSidebar.vue
@@ -20,9 +20,18 @@ const docsUrl = computed(() =>
 
 const categories: { key: ApiDocCategory, labelKey: string }[] = [
   { key: 'image', labelKey: 'api.categories.image' },
+  { key: 'video', labelKey: 'api.categories.video' },
+  { key: 'file', labelKey: 'api.categories.file' },
   { key: 'extension', labelKey: 'api.categories.extension' },
   { key: 'system', labelKey: 'api.categories.system' }
 ]
+const openCategories = ref<Set<ApiDocCategory>>(
+  new Set(
+    categories
+      .filter(category => category.key !== 'video' && category.key !== 'file')
+      .map(category => category.key)
+  )
+)
 
 const filteredEndpoints = computed(() => {
   const q = search.value.trim().toLowerCase()
@@ -38,6 +47,17 @@ function endpointsForCategory(category: ApiDocCategory) {
   return filteredEndpoints.value.filter(endpoint => endpoint.category === category)
 }
 
+function isCategoryOpen(category: ApiDocCategory) {
+  return openCategories.value.has(category)
+}
+
+function toggleCategory(category: ApiDocCategory) {
+  const next = new Set(openCategories.value)
+  if (next.has(category)) next.delete(category)
+  else next.add(category)
+  openCategories.value = next
+}
+
 function onSelect(id: string) {
   emit('select', id)
 }
@@ -59,6 +79,15 @@ onMounted(() => {
   window.addEventListener('keydown', onGlobalKeydown)
   onUnmounted(() => window.removeEventListener('keydown', onGlobalKeydown))
 })
+
+watch(search, (value) => {
+  if (!value.trim()) return
+  const next = new Set(openCategories.value)
+  for (const category of categories) {
+    if (endpointsForCategory(category.key).length) next.add(category.key)
+  }
+  openCategories.value = next
+})
 </script>
 
 <template>
@@ -89,13 +118,24 @@ onMounted(() => {
         :key="category.key"
         class="mb-4"
       >
-        <p
+        <button
           v-if="endpointsForCategory(category.key).length"
-          class="mb-1.5 px-2 text-xs font-medium text-muted"
+          type="button"
+          class="mb-1.5 flex w-full items-center justify-between rounded-md px-2 py-1 text-xs font-medium text-muted transition-colors hover:bg-muted/40 hover:text-highlighted"
+          :aria-expanded="isCategoryOpen(category.key)"
+          @click="toggleCategory(category.key)"
+        >
+          <span>{{ t(category.labelKey) }}</span>
+          <UIcon
+            name="i-lucide-chevron-down"
+            class="size-3.5 transition-transform"
+            :class="isCategoryOpen(category.key) ? '' : '-rotate-90'"
+          />
+        </button>
+        <ul
+          v-show="isCategoryOpen(category.key)"
+          class="space-y-0.5"
         >
-          {{ t(category.labelKey) }}
-        </p>
-        <ul class="space-y-0.5">
           <li
             v-for="endpoint in endpointsForCategory(category.key)"
             :key="endpoint.id"
diff --git a/app/components/storage/BackupJobTable.vue b/app/components/storage/BackupJobTable.vue
index 925a095..959e009 100644
--- a/app/components/storage/BackupJobTable.vue
+++ b/app/components/storage/BackupJobTable.vue
@@ -53,6 +53,12 @@ function progressPercent(job: BackupJobItem): number {
   return Math.min(100, Math.round((job.progress / job.total) * 100))
 }
 
+function progressUnit(job: BackupJobItem): string {
+  return job.type === 'full_restore'
+    ? t('storage.backup.progressUnitObjects')
+    : t('storage.backup.progressUnitMedia')
+}
+
 function jobMessage(job: BackupJobItem): string {
   if (job.status === 'failed') {
     return job.error || job.message || t('storage.backup.jobFailedUnknown')
@@ -174,7 +180,7 @@ function formatTime(value: string) {
                 class="text-xs text-dimmed"
               >—</span>
             </td>
-            <td class="min-w-32 px-4 py-3.5 sm:px-5">
+            <td class="min-w-40 px-4 py-3.5 sm:px-5">
               <div class="flex items-center gap-2">
                 <div class="h-1 min-w-0 flex-1 overflow-hidden rounded-full bg-muted">
                   <div
@@ -183,10 +189,15 @@ function formatTime(value: string) {
                     :style="{ width: `${progressPercent(job)}%` }"
                   />
                 </div>
-                <span class="shrink-0 text-xs tabular-nums text-muted">
-                  <template v-if="job.total">{{ job.progress }}/{{ job.total }}</template>
-                  <template v-else-if="job.status === 'done'">100%</template>
-                  <template v-else>—</template>
+                <span class="flex shrink-0 flex-col text-right">
+                  <span class="text-xs tabular-nums text-muted">
+                    <template v-if="job.total">{{ job.progress }}/{{ job.total }}</template>
+                    <template v-else-if="job.status === 'done'">100%</template>
+                    <template v-else>—</template>
+                  </span>
+                  <span class="text-[10px] text-dimmed">
+                    {{ progressUnit(job) }}
+                  </span>
                 </span>
               </div>
             </td>
diff --git a/app/composables/useApiDocs.ts b/app/composables/useApiDocs.ts
index f04d19d..2f7e4a6 100644
--- a/app/composables/useApiDocs.ts
+++ b/app/composables/useApiDocs.ts
@@ -1,5 +1,5 @@
 export type ApiDocMethod = 'GET' | 'POST' | 'DELETE'
-export type ApiDocCategory = 'image' | 'extension' | 'system'
+export type ApiDocCategory = 'image' | 'video' | 'file' | 'extension' | 'system'
 export type ApiParamLocation = 'form-data' | 'query' | 'header' | 'body'
 
 export interface ApiDocParam {
@@ -251,6 +251,635 @@ export function buildApiDocs(ctx: ApiDocsContext): ApiDocEndpoint[] {
   "success": true,
   "deleted": ["images/2026/08/a.webp"],
   "failed": []
+}`
+    },
+    {
+      id: 'videoUpload',
+      category: 'video',
+      method: 'POST',
+      path: '/api/videos/upload',
+      titleKey: 'api.docs.videoUpload.title',
+      descKey: 'api.docs.videoUpload.desc',
+      requiresAuth: true,
+      params: [
+        {
+          name: 'video',
+          type: 'file',
+          location: 'form-data',
+          required: true,
+          descriptionKey: 'api.params.videoUpload.video'
+        },
+        {
+          name: 'file',
+          type: 'file',
+          location: 'form-data',
+          required: false,
+          descriptionKey: 'api.params.videoUpload.file'
+        },
+        {
+          name: 'files',
+          type: 'file',
+          location: 'form-data',
+          required: false,
+          descriptionKey: 'api.params.videoUpload.files'
+        },
+        {
+          name: 'transcode',
+          type: 'string',
+          location: 'form-data',
+          required: false,
+          descriptionKey: 'api.params.videoUpload.transcode'
+        },
+        {
+          name: 'transcodePreset',
+          type: 'string',
+          location: 'form-data',
+          required: false,
+          descriptionKey: 'api.params.videoUpload.transcodePreset'
+        },
+        {
+          name: 'transcodeBitratePercent',
+          type: 'number',
+          location: 'form-data',
+          required: false,
+          descriptionKey: 'api.params.videoUpload.transcodeBitratePercent'
+        },
+        {
+          name: 'token',
+          type: 'string',
+          location: 'form-data',
+          required: false,
+          descriptionKey: 'api.params.videoUpload.token'
+        }
+      ],
+      curl: `curl -X POST "${baseUrl}/api/videos/upload" \\
+  ${auth} \\
+  -F "video=@./demo.mp4" \\
+  -F "transcode=1" \\
+  -F "transcodePreset=compress" \\
+  -F "transcodeBitratePercent=80"`,
+      responseExample: `{
+  "success": true,
+  "items": [
+    {
+      "key": "videos/2026/10/abc123.mp4",
+      "url": "https://pic.example.com/videos/2026/10/abc123.mp4",
+      "originalName": "demo.mp4",
+      "contentType": "video/mp4",
+      "size": 10485760,
+      "uploadedAt": "2026-10-17T03:00:00.000Z",
+      "markdown": "[demo.mp4](https://pic.example.com/videos/2026/10/abc123.mp4)",
+      "thumbUrl": "https://pic.example.com/videos/2026/10/abc123.webp"
+    }
+  ],
+  "errors": [],
+  "accessMode": "public"
+}`
+    },
+    {
+      id: 'videoList',
+      category: 'video',
+      method: 'GET',
+      path: '/api/files',
+      titleKey: 'api.docs.videoList.title',
+      descKey: 'api.docs.videoList.desc',
+      requiresAuth: true,
+      params: [
+        {
+          name: 'kind',
+          type: 'string',
+          location: 'query',
+          required: true,
+          descriptionKey: 'api.params.mediaList.kindVideo'
+        },
+        {
+          name: 'page',
+          type: 'number',
+          location: 'query',
+          required: false,
+          descriptionKey: 'api.params.mediaList.page'
+        },
+        {
+          name: 'limit',
+          type: 'number',
+          location: 'query',
+          required: false,
+          descriptionKey: 'api.params.mediaList.limit'
+        },
+        {
+          name: 'q',
+          type: 'string',
+          location: 'query',
+          required: false,
+          descriptionKey: 'api.params.mediaList.q'
+        },
+        {
+          name: 'processing',
+          type: 'string',
+          location: 'query',
+          required: false,
+          descriptionKey: 'api.params.mediaList.processing'
+        },
+        {
+          name: 'backendId',
+          type: 'string',
+          location: 'query',
+          required: false,
+          descriptionKey: 'api.params.backendId'
+        },
+        {
+          name: 'uploadSource',
+          type: 'string',
+          location: 'query',
+          required: false,
+          descriptionKey: 'api.params.mediaList.uploadSource'
+        },
+        {
+          name: 'tagIds',
+          type: 'string',
+          location: 'query',
+          required: false,
+          descriptionKey: 'api.params.mediaList.tagIds'
+        },
+        {
+          name: 'tagMode',
+          type: 'string',
+          location: 'query',
+          required: false,
+          descriptionKey: 'api.params.mediaList.tagMode'
+        },
+        {
+          name: 'untagged',
+          type: 'string',
+          location: 'query',
+          required: false,
+          descriptionKey: 'api.params.mediaList.untagged'
+        }
+      ],
+      curl: `curl "${baseUrl}/api/files?kind=video&page=1&limit=20" \\
+  ${auth}`,
+      responseExample: `{
+  "items": [
+    {
+      "key": "videos/2026/10/abc123.mp4",
+      "url": "https://pic.example.com/videos/2026/10/abc123.mp4",
+      "originalName": "demo.mp4",
+      "contentType": "video/mp4",
+      "size": 3580000,
+      "uploadedAt": "2026-10-17T03:00:00.000Z",
+      "transcodeStatus": "done",
+      "transcodeProgress": 100,
+      "transcodePreset": "veryfast",
+      "sourceDeleted": true,
+      "thumbUrl": "https://pic.example.com/videos/2026/10/abc123.webp",
+      "hlsUrl": "https://pic.example.com/videos/2026/10/abc123/index.m3u8",
+      "hlsKey": "videos/2026/10/abc123/index.m3u8"
+    }
+  ],
+  "total": 1,
+  "page": 1,
+  "pageSize": 20,
+  "totalPages": 1,
+  "accessMode": "public"
+}`
+    },
+    {
+      id: 'videoDelete',
+      category: 'video',
+      method: 'DELETE',
+      path: '/api/files',
+      titleKey: 'api.docs.videoDelete.title',
+      descKey: 'api.docs.videoDelete.desc',
+      requiresAuth: true,
+      params: [
+        {
+          name: 'key',
+          type: 'string',
+          location: 'query',
+          required: true,
+          descriptionKey: 'api.params.videoDelete.key'
+        }
+      ],
+      curl: `curl -X DELETE "${baseUrl}/api/files?key=videos/2026/10/abc123.mp4" \\
+  ${auth}`,
+      responseExample: `{
+  "success": true
+}`
+    },
+    {
+      id: 'videoSearch',
+      category: 'video',
+      method: 'GET',
+      path: '/api/videos/search',
+      titleKey: 'api.docs.videoSearch.title',
+      descKey: 'api.docs.videoSearch.desc',
+      requiresAuth: true,
+      params: [
+        {
+          name: 'q',
+          type: 'string',
+          location: 'query',
+          required: true,
+          descriptionKey: 'api.params.mediaSearch.q'
+        },
+        {
+          name: 'page',
+          type: 'number',
+          location: 'query',
+          required: false,
+          descriptionKey: 'api.params.mediaList.page'
+        },
+        {
+          name: 'limit',
+          type: 'number',
+          location: 'query',
+          required: false,
+          descriptionKey: 'api.params.mediaList.limit'
+        },
+        {
+          name: 'backendId',
+          type: 'string',
+          location: 'query',
+          required: false,
+          descriptionKey: 'api.params.backendId'
+        },
+        {
+          name: 'uploadSource',
+          type: 'string',
+          location: 'query',
+          required: false,
+          descriptionKey: 'api.params.mediaList.uploadSource'
+        },
+        {
+          name: 'tagIds',
+          type: 'string',
+          location: 'query',
+          required: false,
+          descriptionKey: 'api.params.mediaList.tagIds'
+        },
+        {
+          name: 'tagMode',
+          type: 'string',
+          location: 'query',
+          required: false,
+          descriptionKey: 'api.params.mediaList.tagMode'
+        },
+        {
+          name: 'untagged',
+          type: 'string',
+          location: 'query',
+          required: false,
+          descriptionKey: 'api.params.mediaList.untagged'
+        },
+        {
+          name: 'processing',
+          type: 'string',
+          location: 'query',
+          required: false,
+          descriptionKey: 'api.params.mediaList.processing'
+        }
+      ],
+      curl: `curl "${baseUrl}/api/videos/search?q=demo&page=1&limit=20" \\
+  ${auth}`,
+      responseExample: `{
+  "items": [
+    {
+      "key": "videos/2026/10/demo.mp4",
+      "originalName": "demo.mp4",
+      "contentType": "video/mp4",
+      "size": 10485760,
+      "transcodeStatus": "done",
+      "thumbUrl": "https://pic.example.com/videos/2026/10/demo.webp",
+      "hlsUrl": "https://pic.example.com/videos/2026/10/demo/index.m3u8"
+    }
+  ],
+  "total": 1,
+  "page": 1,
+  "pageSize": 20,
+  "totalPages": 1,
+  "accessMode": "public"
+}`
+    },
+    {
+      id: 'videoBatchDelete',
+      category: 'video',
+      method: 'POST',
+      path: '/api/files/batch-delete',
+      titleKey: 'api.docs.videoBatchDelete.title',
+      descKey: 'api.docs.videoBatchDelete.desc',
+      requiresAuth: true,
+      params: [
+        {
+          name: 'keys',
+          type: 'string[]',
+          location: 'body',
+          required: true,
+          descriptionKey: 'api.params.videoBatchDelete.keys'
+        }
+      ],
+      curl: `curl -X POST "${baseUrl}/api/files/batch-delete" \\
+  ${auth} \\
+  -H "Content-Type: application/json" \\
+  -d '{"keys":["videos/2026/10/a.mp4","videos/2026/10/b.mp4"]}'`,
+      responseExample: `{
+  "success": true,
+  "deleted": [
+    "videos/2026/10/a.mp4",
+    "videos/2026/10/b.mp4"
+  ],
+  "failed": []
+}`
+    },
+    {
+      id: 'fileUpload',
+      category: 'file',
+      method: 'POST',
+      path: '/api/files/upload',
+      titleKey: 'api.docs.fileUpload.title',
+      descKey: 'api.docs.fileUpload.desc',
+      requiresAuth: true,
+      params: [
+        {
+          name: 'file',
+          type: 'file',
+          location: 'form-data',
+          required: true,
+          descriptionKey: 'api.params.fileUpload.file'
+        },
+        {
+          name: 'files',
+          type: 'file',
+          location: 'form-data',
+          required: false,
+          descriptionKey: 'api.params.fileUpload.files'
+        },
+        {
+          name: 'token',
+          type: 'string',
+          location: 'form-data',
+          required: false,
+          descriptionKey: 'api.params.fileUpload.token'
+        }
+      ],
+      curl: `curl -X POST "${baseUrl}/api/files/upload" \\
+  ${auth} \\
+  -F "file=@./report.pdf"`,
+      responseExample: `{
+  "success": true,
+  "items": [
+    {
+      "key": "files/2026/10/abc123.pdf",
+      "url": "https://pic.example.com/files/2026/10/abc123.pdf",
+      "originalName": "report.pdf",
+      "contentType": "application/pdf",
+      "size": 5242880,
+      "uploadedAt": "2026-10-17T03:00:00.000Z",
+      "markdown": "[report.pdf](https://pic.example.com/files/2026/10/abc123.pdf)"
+    }
+  ],
+  "errors": [],
+  "accessMode": "public"
+}`
+    },
+    {
+      id: 'fileList',
+      category: 'file',
+      method: 'GET',
+      path: '/api/files',
+      titleKey: 'api.docs.fileList.title',
+      descKey: 'api.docs.fileList.desc',
+      requiresAuth: true,
+      params: [
+        {
+          name: 'kind',
+          type: 'string',
+          location: 'query',
+          required: true,
+          descriptionKey: 'api.params.mediaList.kindFile'
+        },
+        {
+          name: 'page',
+          type: 'number',
+          location: 'query',
+          required: false,
+          descriptionKey: 'api.params.mediaList.page'
+        },
+        {
+          name: 'limit',
+          type: 'number',
+          location: 'query',
+          required: false,
+          descriptionKey: 'api.params.mediaList.limit'
+        },
+        {
+          name: 'q',
+          type: 'string',
+          location: 'query',
+          required: false,
+          descriptionKey: 'api.params.mediaList.q'
+        },
+        {
+          name: 'backendId',
+          type: 'string',
+          location: 'query',
+          required: false,
+          descriptionKey: 'api.params.backendId'
+        },
+        {
+          name: 'uploadSource',
+          type: 'string',
+          location: 'query',
+          required: false,
+          descriptionKey: 'api.params.mediaList.uploadSource'
+        },
+        {
+          name: 'tagIds',
+          type: 'string',
+          location: 'query',
+          required: false,
+          descriptionKey: 'api.params.mediaList.tagIds'
+        },
+        {
+          name: 'tagMode',
+          type: 'string',
+          location: 'query',
+          required: false,
+          descriptionKey: 'api.params.mediaList.tagMode'
+        },
+        {
+          name: 'untagged',
+          type: 'string',
+          location: 'query',
+          required: false,
+          descriptionKey: 'api.params.mediaList.untagged'
+        }
+      ],
+      curl: `curl "${baseUrl}/api/files?kind=file&page=1&limit=20" \\
+  ${auth}`,
+      responseExample: `{
+  "items": [
+    {
+      "key": "files/2026/10/abc123.pdf",
+      "url": "https://pic.example.com/files/2026/10/abc123.pdf",
+      "originalName": "report.pdf",
+      "contentType": "application/pdf",
+      "size": 5242880,
+      "uploadedAt": "2026-10-17T03:00:00.000Z",
+      "markdown": "[report.pdf](https://pic.example.com/files/2026/10/abc123.pdf)"
+    }
+  ],
+  "total": 1,
+  "page": 1,
+  "pageSize": 20,
+  "totalPages": 1,
+  "accessMode": "public"
+}`
+    },
+    {
+      id: 'fileDelete',
+      category: 'file',
+      method: 'DELETE',
+      path: '/api/files',
+      titleKey: 'api.docs.fileDelete.title',
+      descKey: 'api.docs.fileDelete.desc',
+      requiresAuth: true,
+      params: [
+        {
+          name: 'key',
+          type: 'string',
+          location: 'query',
+          required: true,
+          descriptionKey: 'api.params.fileDelete.key'
+        }
+      ],
+      curl: `curl -X DELETE "${baseUrl}/api/files?key=files/2026/10/abc123.pdf" \\
+  ${auth}`,
+      responseExample: `{
+  "success": true
+}`
+    },
+    {
+      id: 'fileBatchDelete',
+      category: 'file',
+      method: 'POST',
+      path: '/api/files/batch-delete',
+      titleKey: 'api.docs.fileBatchDelete.title',
+      descKey: 'api.docs.fileBatchDelete.desc',
+      requiresAuth: true,
+      params: [
+        {
+          name: 'keys',
+          type: 'string[]',
+          location: 'body',
+          required: true,
+          descriptionKey: 'api.params.fileBatchDelete.keys'
+        }
+      ],
+      curl: `curl -X POST "${baseUrl}/api/files/batch-delete" \\
+  ${auth} \\
+  -H "Content-Type: application/json" \\
+  -d '{"keys":["files/2026/10/a.pdf","files/2026/10/b.zip"]}'`,
+      responseExample: `{
+  "success": true,
+  "deleted": [
+    "files/2026/10/a.pdf",
+    "files/2026/10/b.zip"
+  ],
+  "failed": []
+}`
+    },
+    {
+      id: 'fileSearch',
+      category: 'file',
+      method: 'GET',
+      path: '/api/files/search',
+      titleKey: 'api.docs.fileSearch.title',
+      descKey: 'api.docs.fileSearch.desc',
+      requiresAuth: true,
+      params: [
+        {
+          name: 'kind',
+          type: 'string',
+          location: 'query',
+          required: true,
+          descriptionKey: 'api.params.mediaList.kindFile'
+        },
+        {
+          name: 'q',
+          type: 'string',
+          location: 'query',
+          required: true,
+          descriptionKey: 'api.params.mediaSearch.q'
+        },
+        {
+          name: 'page',
+          type: 'number',
+          location: 'query',
+          required: false,
+          descriptionKey: 'api.params.mediaList.page'
+        },
+        {
+          name: 'limit',
+          type: 'number',
+          location: 'query',
+          required: false,
+          descriptionKey: 'api.params.mediaList.limit'
+        },
+        {
+          name: 'backendId',
+          type: 'string',
+          location: 'query',
+          required: false,
+          descriptionKey: 'api.params.backendId'
+        },
+        {
+          name: 'uploadSource',
+          type: 'string',
+          location: 'query',
+          required: false,
+          descriptionKey: 'api.params.mediaList.uploadSource'
+        },
+        {
+          name: 'tagIds',
+          type: 'string',
+          location: 'query',
+          required: false,
+          descriptionKey: 'api.params.mediaList.tagIds'
+        },
+        {
+          name: 'tagMode',
+          type: 'string',
+          location: 'query',
+          required: false,
+          descriptionKey: 'api.params.mediaList.tagMode'
+        },
+        {
+          name: 'untagged',
+          type: 'string',
+          location: 'query',
+          required: false,
+          descriptionKey: 'api.params.mediaList.untagged'
+        }
+      ],
+      curl: `curl "${baseUrl}/api/files/search?kind=file&q=report&page=1&limit=20" \\
+  ${auth}`,
+      responseExample: `{
+  "items": [
+    {
+      "key": "files/2026/10/report.pdf",
+      "url": "https://pic.example.com/files/2026/10/report.pdf",
+      "originalName": "report.pdf",
+      "contentType": "application/pdf",
+      "size": 5242880,
+      "uploadedAt": "2026-10-17T03:00:00.000Z",
+      "markdown": "[report.pdf](https://pic.example.com/files/2026/10/report.pdf)"
+    }
+  ],
+  "total": 1,
+  "page": 1,
+  "pageSize": 20,
+  "totalPages": 1,
+  "accessMode": "public"
 }`
     },
     {
diff --git a/app/composables/useMediaUpload.ts b/app/composables/useMediaUpload.ts
index 75cdc95..b6b2beb 100644
--- a/app/composables/useMediaUpload.ts
+++ b/app/composables/useMediaUpload.ts
@@ -89,7 +89,7 @@ export function useMediaUpload(kind: UploadMediaKind) {
   /** 封面缩略图地址（同样按访问模式拼接） */
   function thumbLink(item: FileItem): string {
     const base = item.thumbUrl
-    if (!base) return ''
+    if (!base) return '/video-placeholder.svg'
     if (accessMode.value !== 'token' || !apiToken.value) return base
     const separator = base.includes('?') ? '&' : '?'
     return `${base}${separator}token=${encodeURIComponent(apiToken.value)}`
diff --git a/app/composables/useTranscodeFailureLabel.ts b/app/composables/useTranscodeFailureLabel.ts
new file mode 100644
index 0000000..9a2dc41
--- /dev/null
+++ b/app/composables/useTranscodeFailureLabel.ts
@@ -0,0 +1,12 @@
+export function useTranscodeFailureLabel() {
+  const { t } = useI18n()
+
+  return (error?: string) => {
+    const reason = error === 'ffmpeg-missing'
+      ? t('library.video.transcodeErrorFfmpegMissing')
+      : error === 'permission-denied'
+        ? t('library.video.transcodeErrorPermissionDenied')
+        : t('library.video.transcodeErrorUnknown')
+    return `${t('library.transcodeFailed')} · ${reason}`
+  }
+}
diff --git a/app/pages/storage.vue b/app/pages/storage.vue
index 29daf49..df35171 100644
--- a/app/pages/storage.vue
+++ b/app/pages/storage.vue
@@ -20,6 +20,17 @@ const deleteOpen = ref(false)
 const deleteTarget = ref<StorageBackendItem | null>(null)
 const deleteConfirmName = ref('')
 const deleting = ref(false)
+const clearStorageOpen = ref(false)
+const backupPanelKey = ref(0)
+
+function openClearStorage() {
+  clearStorageOpen.value = true
+}
+
+function handleStorageCleared() {
+  backupPanelKey.value += 1
+  void loadStorage()
+}
 
 const backupPanelRef = ref<{ applySyncDraft: (draft: { fromBackendId: string, toBackendId: string }) => void } | null>(null)
 
@@ -389,11 +400,36 @@ watch(isAuthenticated, async (authed) => {
 
           <StorageBackupPanel
             v-if="!storageData.envOverride"
+            :key="backupPanelKey"
             ref="backupPanelRef"
             :backends="storageData.backends"
           />
 
           <StorageSupportedBackends />
+
+          <section class="rounded-2xl border border-error/30 bg-error/5 p-5 sm:p-6">
+            <div class="flex flex-col gap-4 sm:flex-row sm:items-center sm:justify-between">
+              <div class="min-w-0">
+                <h2 class="flex items-center gap-2 text-base font-semibold text-error">
+                  <UIcon
+                    name="i-lucide-trash-2"
+                    class="size-5"
+                  />
+                  {{ t('storage.clearStorageTitle') }}
+                </h2>
+                <p class="mt-1 text-sm leading-relaxed text-muted">
+                  {{ t('storage.clearStorageDescription') }}
+                </p>
+              </div>
+              <UButton
+                :label="t('storage.clearStorage')"
+                icon="i-lucide-trash-2"
+                color="error"
+                class="shrink-0"
+                @click="openClearStorage"
+              />
+            </div>
+          </section>
         </template>
       </section>
     </AppShell>
@@ -447,5 +483,10 @@ watch(isAuthenticated, async (authed) => {
         </div>
       </template>
     </UModal>
+
+    <ClearStorageModal
+      v-model:open="clearStorageOpen"
+      @cleared="handleStorageCleared"
+    />
   </div>
 </template>
diff --git a/app/types/file.ts b/app/types/file.ts
index 3a69458..1cc327d 100644
--- a/app/types/file.ts
+++ b/app/types/file.ts
@@ -14,6 +14,8 @@ export interface FileItem {
   transcodeProgress?: number
   /** 本视频使用的转码档位 */
   transcodePreset?: string
+  /** 转码失败原因 */
+  transcodeError?: string
   /** HLS 播放列表地址（转码完成后有值） */
   hlsUrl?: string
   /** HLS 播放列表在存储中的 key */
diff --git a/app/types/image.ts b/app/types/image.ts
index d3dd315..838853a 100644
--- a/app/types/image.ts
+++ b/app/types/image.ts
@@ -8,7 +8,10 @@ export type ErrorCode
     | 'UNSUPPORTED_FILE_TYPE'
     | 'INVALID_FILE_SIGNATURE'
     | 'INVALID_IMAGE_KEY'
+    | 'INVALID_VIDEO_KEY'
     | 'IMAGE_NOT_FOUND'
+    | 'HLS_NOT_FOUND'
+    | 'HLS_REMUX_FAILED'
     | 'UPLOAD_FAILED'
     | 'DELETE_FAILED'
 
diff --git a/docs-site/guide/local-dev.md b/docs-site/guide/local-dev.md
index 5ce50e8..cc37257 100644
--- a/docs-site/guide/local-dev.md
+++ b/docs-site/guide/local-dev.md
@@ -6,6 +6,7 @@
 
 - Node.js **22**
 - npm **11**（与 `package.json` 中 `packageManager` 一致）
+- FFmpeg（视频缩略图与 HLS 转码；未安装时视频仍可上传，但使用占位封面）
 
 ## 启动
 
diff --git a/i18n/locales/en.json b/i18n/locales/en.json
index 2472640..c78a9d7 100644
--- a/i18n/locales/en.json
+++ b/i18n/locales/en.json
@@ -8,6 +8,7 @@
     "loadingSession": "Verifying session…",
     "save": "Save",
     "cancel": "Cancel",
+    "continue": "Continue",
     "copy": "Copy",
     "delete": "Delete",
     "edit": "Edit",
@@ -546,7 +547,20 @@
     "storageId": "Storage ID",
     "storageType": "Storage type",
     "badgeLocal": "Local",
-    "defaultStorageTip": "Default storage: new uploads are saved to “{name}”. Use “Set as default” on another backend to change this.",
+    "defaultStorageTip": "All new images, videos, and files are saved to “{name}” by default. Use “Set as default” on another backend to change this.",
+    "clearStorage": "Clear storage",
+    "clearStorageTitle": "Clear my storage",
+    "clearStorageDescription": "Permanently delete every image, video, file, and cache uploaded by the current account without affecting other users.",
+    "clearStorageWarning": "High-risk operation: this will clear all files and caches in storage and cannot be undone!",
+    "clearStorageScope": "Only data and files owned by the current signed-in user are removed. Other users, account settings, storage configuration, and site backups are not affected.",
+    "clearStorageFinalTitle": "Final confirmation",
+    "clearStorageInstruction": "Type “I confirm” to continue. The operation cannot be cancelled or undone once started.",
+    "clearStoragePlaceholder": "I confirm",
+    "clearStoragePhrase": "I confirm",
+    "clearStorageConfirm": "Permanently clear",
+    "clearStorageSuccess": "Cleared {files} files and {cache} temporary caches; storage space has been released",
+    "clearStoragePartial": "{failed}/{total} files failed to clear; please retry",
+    "clearStorageFailed": "Failed to clear storage; please try again",
     "supportedTitle": "Supported backends",
     "supportedSubtitle": "PicHost supports multiple storage backends for different scenarios",
     "supportedLocalDesc": "Ideal for small deployments and personal use",
@@ -554,7 +568,7 @@
     "supportedS3Title": "S3 compatible",
     "supportedS3Desc": "Storage services compatible with the Amazon S3 API",
     "supportedTelegramDesc": "Store images in a Telegram channel or group; good for light unlimited storage",
-    "footerTip": "The default backend receives all new uploads",
+    "footerTip": "The default backend receives all new images, videos, and files",
     "statTotal": "Total",
     "statUsed": "Used",
     "statFree": "Free",
@@ -585,28 +599,28 @@
     "manageStorageHint": "Configure R2 / S3 / COS backends and URL serving",
     "backup": {
       "sectionTitle": "Backup & migration",
-      "sectionSubtitle": "Full-site backup, restore, and cross-backend image migration",
+      "sectionSubtitle": "Full-site backup, restore, and cross-backend file migration",
       "siteTitle": "Site backup & restore",
       "siteSubtitle": "For migration, disaster recovery, and full-site restore",
-      "siteFooterHint": "Backups include the database and images, not plain-text secret_json.",
+      "siteFooterHint": "Backups include the database and all files, not plain-text secret_json.",
       "exportTitle": "Create site backup",
-      "exportSubtitle": "Package the database and all images as .phost.tar.gz",
+      "exportSubtitle": "Package the database and all files as .phost.tar.gz",
       "exportAction": "Start backup",
       "exportStarted": "Backup job started",
       "exportFailed": "Failed to start backup",
       "exportPathHint": "Exports are saved under data/backups/",
       "exportIncludesTitle": "Package includes",
       "exportIncludesDb": "Database snapshot (pichost.db)",
-      "exportIncludesImages": "All image files ({count})",
+      "exportIncludesImages": "All images, videos, and files ({count})",
       "exportExcludesSecrets": "Excludes plain-text secret.json for cloud storage",
       "exportConcurrencyHint": "Only one backup or migration job can run at a time",
       "estimateLoading": "Estimating size…",
-      "estimateImageCountLabel": "Images",
+      "estimateImageCountLabel": "Files",
       "estimatePackageSizeLabel": "Est. package",
       "estimateDatabaseSnapshotLabel": "Database snapshot",
       "estimateStoragePathLabel": "Save location",
       "estimateStoragePathValue": "data/backups/",
-      "estimateImages": "{count} images · {size}",
+      "estimateImages": "{count} files · {size}",
       "estimateDatabase": "Database ~{size}",
       "estimateTotal": "Total ~{size}",
       "restoreTitle": "Restore from backup",
@@ -623,30 +637,30 @@
       "restoreConfirm": "Confirm restore",
       "restoreConfirmTitle": "Confirm site restore",
       "restoreConfirmSource": "Source: {name}",
-      "restoreOverwriteWarning": "Overwrite mode replaces conflicting images and the database. Ensure you have a current backup.",
+      "restoreOverwriteWarning": "Overwrite mode replaces conflicting files and the database. Ensure you have a current backup.",
       "restoreSelectRequired": "Select or upload a backup file",
       "restoreStarted": "Restore job started",
       "restoreFailed": "Restore failed",
       "conflictMode": "Conflict policy",
-      "conflictSkip": "Skip existing images",
-      "conflictOverwrite": "Overwrite existing images and database",
+      "conflictSkip": "Skip existing files",
+      "conflictOverwrite": "Overwrite existing files and database",
       "syncTitle": "Cross-backend sync",
       "syncMigrateTitle": "Cross-backend migration",
-      "syncMigrateSubtitle": "Migrate images between configured backends",
-      "syncSubtitle": "Copy images between configured backends and update the index",
+      "syncMigrateSubtitle": "Migrate files between configured backends",
+      "syncSubtitle": "Copy files between configured backends and update the index",
       "syncFrom": "Source backend",
       "syncTo": "Target backend",
-      "syncPendingImages": "Images to migrate",
+      "syncPendingImages": "Files to migrate",
       "syncPendingSize": "Est. size",
       "syncIncludesTitle": "What sync does",
-      "syncIncludesCopy": "Copy image files from source to target backend",
+      "syncIncludesCopy": "Copy images, videos, and files from source to target backend",
       "syncIncludesIndex": "Update storage_backend_id in the index",
       "syncIncludesConfig": "Site settings and other backends are unchanged",
       "syncDryRun": "Dry run only",
       "syncSetDefaultAfter": "Set target as default after migration",
       "syncStartMigrate": "Start migration",
       "syncPreviewOnly": "Preview",
-      "syncFooterHint": "Only image files and index are migrated; site settings are unchanged.",
+      "syncFooterHint": "Only files and index are migrated; site settings are unchanged.",
       "syncDeleteSource": "Delete source files after sync",
       "syncSetDefault": "Set target as default after sync",
       "syncPreview": "Preview & start",
@@ -658,8 +672,8 @@
       "syncStarted": "Sync job started",
       "syncFailed": "Sync failed",
       "previewFailed": "Preview failed",
-      "previewImages": "Images",
-      "previewNew": "New images",
+      "previewImages": "Files",
+      "previewNew": "New files",
       "previewConflicts": "Conflicts",
       "previewCreated": "Backup created",
       "previewSize": "Data size",
@@ -672,6 +686,8 @@
       "colType": "Type",
       "colStatus": "Status",
       "colProgress": "Progress",
+      "progressUnitMedia": "media records",
+      "progressUnitObjects": "storage objects",
       "colMessage": "Message",
       "colCreated": "Created",
       "colActions": "Actions",
@@ -691,8 +707,8 @@
       "jobRunning": "Another job is already running. Try again later.",
       "migrateIn": "Migrate in",
       "migrateOut": "Migrate out",
-      "migrateInHint": "Copy images from the default backend to this one",
-      "migrateOutHint": "Move images out of this backend",
+      "migrateInHint": "Copy files from the default backend to this one",
+      "migrateOutHint": "Move files out of this backend",
       "syncDraftApplied": "Sync form prefilled — review and start when ready",
       "syncNeedTwoBackends": "At least two storage backends are required to sync",
       "selectBackend": "Select backend",
@@ -869,7 +885,7 @@
     "envOverrideTitle": "Token overridden by environment",
     "envOverrideDesc": "Restart after changing API_UPLOAD_TOKEN; cannot regenerate in UI.",
     "personalTitle": "Personal API token",
-    "personalDesc": "For your scripts only; uploads belong to your account.",
+    "personalDesc": "For your scripts only; uploaded images, videos and files belong to your account.",
     "notConfiguredTitle": "No token configured",
     "notConfiguredDesc": "A token is created automatically on first visit, or click Regenerate.",
     "regenerate": "Regenerate",
@@ -911,6 +927,8 @@
     "responseExample": "Response example",
     "categories": {
       "image": "Images",
+      "video": "Videos",
+      "file": "Files",
       "extension": "Plugins",
       "system": "System"
     },
@@ -935,6 +953,47 @@
       "batchDelete": {
         "keys": "Array of image keys to delete"
       },
+      "videoUpload": {
+        "video": "Primary video field; max 500 MB per file",
+        "file": "Compatibility field, can replace video",
+        "files": "Compatibility field for multiple videos",
+        "transcode": "Set to 1 to transcode to HLS asynchronously; otherwise keep the source and generate a thumbnail",
+        "transcodePreset": "Optional preset: copy, veryfast, medium, slow, or compress (target bitrate)",
+        "transcodeBitratePercent": "Used by compress only; target bitrate as 10–100% of the source. Uses the current server setting when omitted",
+        "token": "Optional; the API token can also be sent with the Auth-Token header"
+      },
+      "fileUpload": {
+        "file": "Primary file field; max 100 MB per file. HTML / HTM / SVG are blocked",
+        "files": "Compatibility field for multiple files",
+        "token": "Optional; the API token can also be sent with the Auth-Token header"
+      },
+      "mediaList": {
+        "kindVideo": "Set to video to list videos",
+        "kindFile": "Set to file to list files",
+        "page": "Page number, starts at 1",
+        "limit": "Page size, default 20, max 100",
+        "q": "Search by filename or path",
+        "processing": "Video only; set to 1 to return queued or running transcodes",
+        "uploadSource": "Upload source: web or api",
+        "tagIds": "Filter by comma-separated tag IDs",
+        "tagMode": "Use or or and for multiple tags; default is or",
+        "untagged": "Set to 1 to return only untagged items"
+      },
+      "mediaSearch": {
+        "q": "Search keyword matched against filename or storage path; required"
+      },
+      "videoDelete": {
+        "key": "Video storage path; also removes its thumbnail and HLS artifacts"
+      },
+      "videoBatchDelete": {
+        "keys": "Array of video keys; up to 100 per request. Thumbnails and HLS artifacts are also removed"
+      },
+      "fileDelete": {
+        "key": "File storage path, e.g. files/2026/10/xxx.pdf"
+      },
+      "fileBatchDelete": {
+        "keys": "Array of file keys; up to 100 per request"
+      },
       "twikoo": {
         "image": "Image file",
         "token": "API token"
@@ -955,9 +1014,9 @@
       "sendFailed": "Request failed",
       "networkError": "Network error or unreachable",
       "notesTitle": "Notes",
-      "noteSuccess": "200 means success with JSON body",
+      "noteSuccess": "200 means success with a JSON body",
       "noteError": "4xx / 5xx means failure; check error field",
-      "noteLimit": "Upload limit: up to 10 files, 10 MB each"
+      "noteLimit": "Upload limit: up to 10 files; videos up to 500 MB each, files up to 100 MB each"
     },
     "docs": {
       "upload": {
@@ -980,6 +1039,46 @@
         "title": "Batch delete",
         "desc": "Delete multiple images; request body is a keys array."
       },
+      "videoUpload": {
+        "title": "Upload videos",
+        "desc": "Upload MP4 / WebM / MOV / MKV and more, up to 10 files and 500 MB each. A thumbnail is generated independently; transcode=1 starts asynchronous HLS transcoding."
+      },
+      "videoList": {
+        "title": "List videos",
+        "desc": "Use kind=video to list videos, including untranscoded, completed and failed items. processing=1 returns only queued or running jobs."
+      },
+      "videoDelete": {
+        "title": "Delete video",
+        "desc": "Delete a video by key, including its thumbnail and generated HLS playlist and segments."
+      },
+      "videoSearch": {
+        "title": "Search videos",
+        "desc": "Search by filename or storage path with pagination, backend, upload source and tag filters; q is required."
+      },
+      "videoBatchDelete": {
+        "title": "Batch delete videos",
+        "desc": "Delete up to 100 videos at once, including each video's thumbnail, HLS playlist and segments."
+      },
+      "fileUpload": {
+        "title": "Upload files",
+        "desc": "Upload any file, up to 10 files and 100 MB each. HTML, HTM and SVG are blocked."
+      },
+      "fileList": {
+        "title": "List files",
+        "desc": "Use kind=file to paginate file-bed entries with search, storage, source and tag filters."
+      },
+      "fileDelete": {
+        "title": "Delete file",
+        "desc": "Delete one file by its storage key. This action cannot be undone."
+      },
+      "fileSearch": {
+        "title": "Search files",
+        "desc": "Search by filename or storage path with kind=file, pagination, backend, upload source and tag filters."
+      },
+      "fileBatchDelete": {
+        "title": "Batch delete files",
+        "desc": "Delete up to 100 files at once. The response reports deleted and failed keys separately."
+      },
       "twikoo": {
         "title": "Twikoo-compatible upload",
         "desc": "Twikoo / EasyImage 2.0 protocol; stored under images/. Fields: image + token."
@@ -1058,6 +1157,14 @@
       "previewKey": "Video path",
       "transcodeNone": "Not transcoded",
       "transcodeDone": "Done (m3u8)",
+      "transcodeErrorFfmpegMissing": "No FFmpeg",
+      "transcodeErrorPermissionDenied": "File permission denied",
+      "transcodeErrorUnknown": "Unknown reason",
+      "downloadMp4": "Download MP4",
+      "downloadMp4Title": "Download MP4 video",
+      "downloadMp4Confirm": "The video segments will be merged into an MP4 file. Continue?",
+      "downloadMp4Working": "Merging video segments, please wait…",
+      "downloadMp4Failed": "Video merge failed. Please try again later.",
       "uploadTitle": "Drop videos here to upload",
       "uploadHint": "or click to choose video files, up to 10 at a time",
       "uploadFormats": "MP4 / WebM / MOV / MKV and more, up to 100MB per file",
diff --git a/i18n/locales/zh-CN.json b/i18n/locales/zh-CN.json
index a91c3b5..7f6aefc 100644
--- a/i18n/locales/zh-CN.json
+++ b/i18n/locales/zh-CN.json
@@ -8,6 +8,7 @@
     "loadingSession": "正在验证登录状态…",
     "save": "保存",
     "cancel": "取消",
+    "continue": "继续",
     "copy": "复制",
     "delete": "删除",
     "edit": "编辑",
@@ -546,7 +547,20 @@
     "storageId": "存储标识",
     "storageType": "存储类型",
     "badgeLocal": "本地",
-    "defaultStorageTip": "默认存储提示：新上传的图片将默认保存到「{name}」。可点击其他后端的「设为默认」进行修改。",
+    "defaultStorageTip": "新上传的所有图片、视频、文件将默认保存到「{name}」。可点击其他后端的「设为默认」进行修改。",
+    "clearStorage": "清空存储",
+    "clearStorageTitle": "清空我的存储",
+    "clearStorageDescription": "永久删除当前账号上传的所有图片、视频、文件和缓存，不影响其他用户的数据。",
+    "clearStorageWarning": "高危风险：此操作会清空存储中的所有文件和缓存，无法撤销！",
+    "clearStorageScope": "只会清除当前登录用户的数据和文件。其他用户的数据、账户、存储配置和全站备份不会被删除。",
+    "clearStorageFinalTitle": "最终确认",
+    "clearStorageInstruction": "请输入“我已确认”以继续。操作开始后无法取消或撤销。",
+    "clearStoragePlaceholder": "我已确认",
+    "clearStoragePhrase": "我已确认",
+    "clearStorageConfirm": "永久清空",
+    "clearStorageSuccess": "已清空 {files} 个文件和 {cache} 个临时缓存，存储空间已释放",
+    "clearStoragePartial": "{failed}/{total} 个文件清理失败，请重试",
+    "clearStorageFailed": "清空存储失败，请稍后重试",
     "supportedTitle": "支持的存储后端",
     "supportedSubtitle": "PicHost 支持多种存储后端，满足不同场景需求",
     "supportedLocalDesc": "适合小型部署和个人使用",
@@ -554,7 +568,7 @@
     "supportedS3Title": "S3 兼容",
     "supportedS3Desc": "兼容 Amazon S3 协议的存储服务",
     "supportedTelegramDesc": "用 Telegram 频道/群组存图，适合轻量与无限容量场景",
-    "footerTip": "默认存储后端将自动接收所有新上传的图片",
+    "footerTip": "默认存储后端将自动接收所有新上传的图片、视频和文件",
     "statTotal": "总量",
     "statUsed": "已用",
     "statFree": "剩余",
@@ -585,28 +599,28 @@
     "manageStorageHint": "配置 R2 / S3 / COS 等多后端与直链策略",
     "backup": {
       "sectionTitle": "备份与迁移",
-      "sectionSubtitle": "整站备份恢复与跨后端图片迁移",
+      "sectionSubtitle": "整站备份恢复与跨后端文件迁移",
       "siteTitle": "站点备份与恢复",
       "siteSubtitle": "用于换机、灾备与整站恢复",
-      "siteFooterHint": "备份包含数据库与图片，不包含 secret_json 明文。",
+      "siteFooterHint": "备份包含数据库与全部文件，不包含 secret_json 明文。",
       "exportTitle": "创建站点备份",
-      "exportSubtitle": "打包数据库与全部图片为 .phost.tar.gz",
+      "exportSubtitle": "打包数据库与全部文件为 .phost.tar.gz",
       "exportAction": "开始备份",
       "exportStarted": "备份任务已开始",
       "exportFailed": "创建备份失败",
       "exportPathHint": "导出文件保存在 data/backups/",
       "exportIncludesTitle": "备份包含",
       "exportIncludesDb": "数据库快照（pichost.db）",
-      "exportIncludesImages": "全部图片文件（{count} 张）",
+      "exportIncludesImages": "全部图片、视频和文件（{count} 个）",
       "exportExcludesSecrets": "不含云存储 secret.json 明文",
       "exportConcurrencyHint": "同时仅可运行一个备份或迁移任务",
       "estimateLoading": "正在估算体积…",
-      "estimateImageCountLabel": "图片总数",
+      "estimateImageCountLabel": "文件总数",
       "estimatePackageSizeLabel": "预计备份包",
       "estimateDatabaseSnapshotLabel": "数据库快照",
       "estimateStoragePathLabel": "保存位置",
       "estimateStoragePathValue": "data/backups/",
-      "estimateImages": "图片 {count} 张 · {size}",
+      "estimateImages": "文件 {count} 个 · {size}",
       "estimateDatabase": "数据库约 {size}",
       "estimateTotal": "合计约 {size}",
       "restoreTitle": "从备份恢复",
@@ -623,44 +637,44 @@
       "restoreConfirm": "确认恢复",
       "restoreConfirmTitle": "确认恢复站点",
       "restoreConfirmSource": "来源：{name}",
-      "restoreOverwriteWarning": "覆盖模式将替换冲突图片与数据库，请确认已做好当前站点备份",
+      "restoreOverwriteWarning": "覆盖模式将替换冲突文件与数据库，请确认已做好当前站点备份",
       "restoreSelectRequired": "请选择或上传备份文件",
       "restoreStarted": "恢复任务已开始",
       "restoreFailed": "恢复失败",
       "conflictMode": "冲突策略",
-      "conflictSkip": "跳过已存在图片",
-      "conflictOverwrite": "覆盖已存在图片与数据库",
+      "conflictSkip": "跳过已存在文件",
+      "conflictOverwrite": "覆盖已存在文件与数据库",
       "syncTitle": "跨后端同步",
       "syncMigrateTitle": "跨后端迁移",
-      "syncMigrateSubtitle": "在已配置后端之间迁移图片",
-      "syncSubtitle": "在已配置的后端之间拷贝图片并更新索引",
+      "syncMigrateSubtitle": "在已配置后端之间迁移文件",
+      "syncSubtitle": "在已配置的后端之间拷贝文件并更新索引",
       "syncFrom": "源后端",
       "syncTo": "目标后端",
-      "syncPendingImages": "待迁移图片",
+      "syncPendingImages": "待迁移文件",
       "syncPendingSize": "预计体积",
       "syncIncludesTitle": "同步说明",
-      "syncIncludesCopy": "拷贝源端图片文件到目标后端",
+      "syncIncludesCopy": "拷贝源端图片、视频和文件到目标后端",
       "syncIncludesIndex": "更新索引中的 storage_backend_id",
       "syncIncludesConfig": "不修改站点配置与其它后端数据",
       "syncDryRun": "仅预览 Dry Run",
       "syncSetDefaultAfter": "迁移后设为默认后端",
       "syncStartMigrate": "开始迁移",
       "syncPreviewOnly": "预览",
-      "syncFooterHint": "仅迁移图片文件与索引，不影响站点配置。",
+      "syncFooterHint": "仅迁移文件与索引，不影响站点配置。",
       "syncDeleteSource": "同步后删除源端文件",
       "syncSetDefault": "同步后将目标设为默认",
       "syncPreview": "预检并开始",
       "syncConfirm": "开始同步",
       "syncConfirmTitle": "确认跨后端同步",
-      "syncDeleteWarning": "将删除源后端上的图片文件，此操作不可撤销",
+      "syncDeleteWarning": "将删除源后端上的文件，此操作不可撤销",
       "syncSelectRequired": "请选择源与目标后端",
       "syncSameBackend": "源与目标不能相同",
       "syncStarted": "同步任务已开始",
       "syncFailed": "同步失败",
       "previewFailed": "预检失败",
-      "previewImages": "图片数量",
-      "previewNew": "新增图片",
-      "previewConflicts": "冲突图片",
+      "previewImages": "文件数量",
+      "previewNew": "新增文件",
+      "previewConflicts": "冲突文件",
       "previewCreated": "备份时间",
       "previewSize": "数据量",
       "jobsTitle": "最近任务",
@@ -672,6 +686,8 @@
       "colType": "类型",
       "colStatus": "状态",
       "colProgress": "进度",
+      "progressUnitMedia": "媒体记录",
+      "progressUnitObjects": "存储对象",
       "colMessage": "说明",
       "colCreated": "创建时间",
       "colActions": "操作",
@@ -691,8 +707,8 @@
       "jobRunning": "已有任务正在运行，请稍后再试",
       "migrateIn": "迁入",
       "migrateOut": "迁出",
-      "migrateInHint": "从默认后端拷贝图片到此后端",
-      "migrateOutHint": "将图片从此后端迁出",
+      "migrateInHint": "从默认后端拷贝文件到此后端",
+      "migrateOutHint": "将文件从此后端迁出",
       "syncDraftApplied": "已填入同步表单，请确认后开始",
       "syncNeedTwoBackends": "至少需要两个存储后端才能同步",
       "selectBackend": "选择后端",
@@ -869,7 +885,7 @@
     "envOverrideTitle": "Token 由环境变量覆盖",
     "envOverrideDesc": "修改 API_UPLOAD_TOKEN 后需重启服务；后台无法重新生成。",
     "personalTitle": "个人 API Token",
-    "personalDesc": "此 Token 仅用于您自己的脚本上传，上传的图片归属您的账号。",
+    "personalDesc": "此 Token 仅用于您自己的脚本上传，上传的图片、视频或文件归属您的账号。",
     "notConfiguredTitle": "尚未配置 Token",
     "notConfiguredDesc": "首次打开会自动创建 Token，或点击「重新生成」。",
     "regenerate": "重新生成",
@@ -911,6 +927,8 @@
     "responseExample": "响应示例",
     "categories": {
       "image": "图片接口",
+      "video": "视频接口",
+      "file": "文件接口",
       "extension": "插件接口",
       "system": "系统通用"
     },
@@ -938,6 +956,47 @@
       "batchDelete": {
         "keys": "要删除的图片 key 数组"
       },
+      "videoUpload": {
+        "video": "上传视频主字段，单文件最大 500 MB",
+        "file": "兼容字段，可代替 video",
+        "files": "兼容字段，可一次上传多个视频",
+        "transcode": "设为 1 后异步转码为 HLS；不设置则只保留原视频并生成缩略图",
+        "transcodePreset": "可选转码档位：copy（直接封装）、veryfast（速度）、medium（平衡）、slow（质量）、compress（目标码率压缩）",
+        "transcodeBitratePercent": "仅 compress 档使用，目标码率为源码率的 10–100% 整数；省略时使用服务端当前设置",
+        "token": "可选，API Token 也可通过 Auth-Token 请求头传递"
+      },
+      "fileUpload": {
+        "file": "上传文件主字段，单文件最大 100 MB；禁止 HTML / HTM / SVG",
+        "files": "兼容字段，可一次上传多个文件",
+        "token": "可选，API Token 也可通过 Auth-Token 请求头传递"
+      },
+      "mediaList": {
+        "kindVideo": "固定为 video，获取视频列表",
+        "kindFile": "固定为 file，获取文件列表",
+        "page": "页码，从 1 开始",
+        "limit": "每页条数，默认 20，最大 100",
+        "q": "按文件名或路径关键词搜索",
+        "processing": "视频专用；设为 1 时只返回排队中或转码中的视频",
+        "uploadSource": "上传来源：web 或 api",
+        "tagIds": "按标签筛选，逗号分隔标签 ID",
+        "tagMode": "多标签筛选时使用 or 或 and，默认 or",
+        "untagged": "设为 1 时仅返回未标记内容"
+      },
+      "mediaSearch": {
+        "q": "搜索关键词，匹配文件名或存储路径；不能为空"
+      },
+      "videoDelete": {
+        "key": "视频存储路径；删除时同时清理缩略图与 HLS 文件"
+      },
+      "videoBatchDelete": {
+        "keys": "要删除的视频 key 数组，单次最多 100 个；同时清理缩略图和 HLS 文件"
+      },
+      "fileDelete": {
+        "key": "文件存储路径，如 files/2026/10/xxx.pdf"
+      },
+      "fileBatchDelete": {
+        "keys": "要删除的文件 key 数组，单次最多 100 个"
+      },
       "twikoo": {
         "image": "上传图片",
         "token": "API Token"
@@ -960,7 +1019,7 @@
       "notesTitle": "响应说明",
       "noteSuccess": "200 表示请求成功，返回 JSON 数据",
       "noteError": "4xx / 5xx 表示请求失败，查看 error 字段",
-      "noteLimit": "上传限制：单次最多 10 张，单张最大 10 MB"
+      "noteLimit": "上传限制：单次最多 10 个；视频单文件最大 500 MB，文件单文件最大 100 MB"
     },
     "docs": {
       "upload": {
@@ -983,6 +1042,46 @@
         "title": "批量删除",
         "desc": "一次删除多张图片，请求体为 keys 数组。"
       },
+      "videoUpload": {
+        "title": "上传视频",
+        "desc": "上传 MP4 / WebM / MOV / MKV 等视频，单次最多 10 个、单文件最大 500 MB。上传后独立生成缩略图；transcode=1 时再异步转码为 HLS。"
+      },
+      "videoList": {
+        "title": "获取视频列表",
+        "desc": "设置 kind=video 获取视频。默认包含未转码、已完成和失败条目；processing=1 仅查看排队中或转码中的任务。"
+      },
+      "videoDelete": {
+        "title": "删除视频",
+        "desc": "通过视频 key 删除视频，同时清理缩略图和已生成的 HLS 播放列表与分片。"
+      },
+      "videoSearch": {
+        "title": "搜索视频",
+        "desc": "按文件名或存储路径搜索视频，支持分页、存储后端、上传来源和标签筛选；q 必填。"
+      },
+      "videoBatchDelete": {
+        "title": "批量删除视频",
+        "desc": "一次删除最多 100 个视频；每个视频的缩略图、HLS 播放列表与分片会一并清理。"
+      },
+      "fileUpload": {
+        "title": "上传文件",
+        "desc": "上传任意文件，单次最多 10 个、单文件最大 100 MB；禁止上传 HTML、HTM 和 SVG。"
+      },
+      "fileList": {
+        "title": "获取文件列表",
+        "desc": "设置 kind=file 分页获取文件床内容，支持搜索、存储后端、来源和标签筛选。"
+      },
+      "fileDelete": {
+        "title": "删除文件",
+        "desc": "通过文件 key 删除单个文件，操作不可恢复。"
+      },
+      "fileSearch": {
+        "title": "搜索文件",
+        "desc": "按文件名或存储路径搜索文件，设置 kind=file；支持分页、存储后端、上传来源和标签筛选。"
+      },
+      "fileBatchDelete": {
+        "title": "批量删除文件",
+        "desc": "一次删除最多 100 个文件，响应会分别返回删除成功和失败的 key。"
+      },
       "twikoo": {
         "title": "twikoo 兼容上传",
         "desc": "兼容 Twikoo / EasyImage 2.0 协议，图片存入 images/ 目录；字段 image + token。"
@@ -1061,6 +1160,14 @@
       "previewKey": "视频路径",
       "transcodeNone": "未转码",
       "transcodeDone": "已完成（m3u8）",
+      "transcodeErrorFfmpegMissing": "无 FFmpeg",
+      "transcodeErrorPermissionDenied": "无文件权限",
+      "transcodeErrorUnknown": "原因未知",
+      "downloadMp4": "下载 MP4",
+      "downloadMp4Title": "下载 MP4 视频",
+      "downloadMp4Confirm": "将会合并视频切片到 MP4，是否继续？",
+      "downloadMp4Working": "正在合并视频切片，请稍候…",
+      "downloadMp4Failed": "视频合并失败，请稍后重试",
       "uploadTitle": "拖拽视频到此处上传",
       "uploadHint": "或点击选择视频文件，单次最多 10 个",
       "uploadFormats": "支持 MP4 / WebM / MOV / MKV 等，单个文件最大 100MB",
diff --git a/public/video-placeholder.svg b/public/video-placeholder.svg
new file mode 100644
index 0000000..1645914
--- /dev/null
+++ b/public/video-placeholder.svg
@@ -0,0 +1,17 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 640 360" role="img" aria-label="Video">
+  <defs>
+    <linearGradient id="background" x1="0" y1="0" x2="1" y2="1">
+      <stop offset="0" stop-color="#111827"/>
+      <stop offset="1" stop-color="#1f2937"/>
+    </linearGradient>
+    <radialGradient id="glow" cx="50%" cy="45%" r="60%">
+      <stop offset="0" stop-color="#334155" stop-opacity=".75"/>
+      <stop offset="1" stop-color="#334155" stop-opacity="0"/>
+    </radialGradient>
+  </defs>
+  <rect width="640" height="360" fill="url(#background)"/>
+  <rect width="640" height="360" fill="url(#glow)"/>
+  <rect x="22" y="22" width="596" height="316" rx="18" fill="none" stroke="#94a3b8" stroke-opacity=".18" stroke-width="2"/>
+  <circle cx="320" cy="180" r="52" fill="#0f172a" fill-opacity=".82" stroke="#cbd5e1" stroke-opacity=".4" stroke-width="2"/>
+  <path d="M307 151c0-7 8-11 14-7l34 25c5 4 5 11 0 15l-34 25c-6 4-14 0-14-7z" fill="#cbd5e1" fill-opacity=".86"/>
+</svg>
diff --git a/server/api/admin/backup/estimate.get.ts b/server/api/admin/backup/estimate.get.ts
index 4e8cdc2..05d2bea 100644
--- a/server/api/admin/backup/estimate.get.ts
+++ b/server/api/admin/backup/estimate.get.ts
@@ -1,12 +1,23 @@
 import { requireAdminAuth } from '../../../utils/access'
 import { getBackupExportEstimate } from '../../../utils/backup/stats'
 import { getBackupsDir, isSafeBackupFilename } from '../../../utils/backup/paths'
+import { listAllBackupJobsForUser } from '../../../utils/backup/jobs'
+import { basename, join } from 'node:path'
 import { promises as fs } from 'node:fs'
-import { join } from 'node:path'
 
 export default defineEventHandler(async (event) => {
-  await requireAdminAuth(event)
+  const user = await requireAdminAuth(event)
   const estimate = await getBackupExportEstimate()
+  const allowedArchives = new Set(
+    listAllBackupJobsForUser(user.id).flatMap((job) => {
+      const names: string[] = []
+      if (job.outputPath) names.push(basename(job.outputPath))
+      if (typeof job.payload.archivePath === 'string') {
+        names.push(basename(job.payload.archivePath))
+      }
+      return names
+    })
+  )
 
   const packages = await (async () => {
     try {
@@ -15,6 +26,7 @@ export default defineEventHandler(async (event) => {
       const items = await Promise.all(
         entries
           .filter(entry => entry.isFile() && isSafeBackupFilename(entry.name))
+          .filter(entry => allowedArchives.has(entry.name))
           .map(async (entry) => {
             const full = join(getBackupsDir(), entry.name)
             const fileStat = await fs.stat(full)
diff --git a/server/api/admin/backup/export.post.ts b/server/api/admin/backup/export.post.ts
index 337b827..3174818 100644
--- a/server/api/admin/backup/export.post.ts
+++ b/server/api/admin/backup/export.post.ts
@@ -5,14 +5,14 @@ import { getBackupExportEstimate } from '../../../utils/backup/stats'
 import { startFullExportJob } from '../../../utils/backup/runner'
 
 export default defineEventHandler(async (event) => {
-  await requireAdminAuth(event)
+  const user = await requireAdminAuth(event)
   const config = useRuntimeConfig(event)
   const appVersion = String(config.appVersion ?? '0.0.0')
 
   const estimate = await getBackupExportEstimate()
 
   try {
-    const job = startFullExportJob(appVersion)
+    const job = startFullExportJob(appVersion, user.id)
     return {
       job: serializeBackupJob(job),
       estimate
diff --git a/server/api/admin/backup/jobs/[id].get.ts b/server/api/admin/backup/jobs/[id].get.ts
index 5221efd..04d12db 100644
--- a/server/api/admin/backup/jobs/[id].get.ts
+++ b/server/api/admin/backup/jobs/[id].get.ts
@@ -4,13 +4,13 @@ import { serializeBackupJob } from '../../../../utils/backup/api'
 import { getBackupJob } from '../../../../utils/backup/jobs'
 
 export default defineEventHandler(async (event) => {
-  await requireAdminAuth(event)
+  const user = await requireAdminAuth(event)
   const id = getRouterParam(event, 'id')
   if (!id) {
     createApiError(event, 'INVALID_REQUEST', '缺少任务 ID', 400)
   }
 
-  const job = getBackupJob(id)
+  const job = getBackupJob(id, user.id)
   if (!job) {
     createApiError(event, 'INVALID_REQUEST', '任务不存在', 404)
   }
diff --git a/server/api/admin/backup/jobs/[id]/cancel.post.ts b/server/api/admin/backup/jobs/[id]/cancel.post.ts
index 100aeb7..4e8f869 100644
--- a/server/api/admin/backup/jobs/[id]/cancel.post.ts
+++ b/server/api/admin/backup/jobs/[id]/cancel.post.ts
@@ -5,16 +5,19 @@ import { getBackupJob } from '../../../../../utils/backup/jobs'
 import { cancelBackupJob } from '../../../../../utils/backup/runner'
 
 export default defineEventHandler(async (event) => {
-  await requireAdminAuth(event)
+  const user = await requireAdminAuth(event)
   const id = getRouterParam(event, 'id')
   if (!id) {
     createApiError(event, 'INVALID_REQUEST', '缺少任务 ID', 400)
   }
 
+  if (!getBackupJob(id, user.id)) {
+    createApiError(event, 'INVALID_REQUEST', '任务不存在', 404)
+  }
   if (!cancelBackupJob(id)) {
     createApiError(event, 'INVALID_REQUEST', '只能取消进行中的任务', 400)
   }
 
-  const job = getBackupJob(id)
+  const job = getBackupJob(id, user.id)
   return { job: job ? serializeBackupJob(job) : null }
 })
diff --git a/server/api/admin/backup/jobs/[id]/download.get.ts b/server/api/admin/backup/jobs/[id]/download.get.ts
index 2b6b814..7f32b4a 100644
--- a/server/api/admin/backup/jobs/[id]/download.get.ts
+++ b/server/api/admin/backup/jobs/[id]/download.get.ts
@@ -6,13 +6,13 @@ import { getBackupJob } from '../../../../../utils/backup/jobs'
 import { BACKUP_ARCHIVE_EXT } from '../../../../../utils/backup/paths'
 
 export default defineEventHandler(async (event) => {
-  await requireAdminAuth(event)
+  const user = await requireAdminAuth(event)
   const id = getRouterParam(event, 'id')
   if (!id) {
     createApiError(event, 'INVALID_REQUEST', '缺少任务 ID', 400)
   }
 
-  const job = getBackupJob(id)
+  const job = getBackupJob(id, user.id)
   if (!job || job.type !== 'full_export' || job.status !== 'done' || !job.outputPath) {
     createApiError(event, 'INVALID_REQUEST', '可下载的备份不存在', 404)
   }
diff --git a/server/api/admin/backup/jobs/[id]/retry.post.ts b/server/api/admin/backup/jobs/[id]/retry.post.ts
index 31f1eaa..901efc7 100644
--- a/server/api/admin/backup/jobs/[id]/retry.post.ts
+++ b/server/api/admin/backup/jobs/[id]/retry.post.ts
@@ -5,13 +5,13 @@ import { serializeBackupJob } from '../../../../../utils/backup/api'
 import { getBackupJob } from '../../../../../utils/backup/jobs'
 
 export default defineEventHandler(async (event) => {
-  await requireAdminAuth(event)
+  const user = await requireAdminAuth(event)
   const id = getRouterParam(event, 'id')
   if (!id) {
     createApiError(event, 'INVALID_REQUEST', '缺少任务 ID', 400)
   }
 
-  const job = getBackupJob(id)
+  const job = getBackupJob(id, user.id)
   if (!job || job.type !== 'backend_sync') {
     createApiError(event, 'INVALID_REQUEST', '任务不存在', 404)
   }
@@ -23,6 +23,6 @@ export default defineEventHandler(async (event) => {
     createApiError(event, 'INVALID_REQUEST', message, 400)
   }
 
-  const updated = getBackupJob(id)
+  const updated = getBackupJob(id, user.id)
   return { job: updated ? serializeBackupJob(updated) : null }
 })
diff --git a/server/api/admin/backup/jobs/index.get.ts b/server/api/admin/backup/jobs/index.get.ts
index 2f939f4..0c1e8db 100644
--- a/server/api/admin/backup/jobs/index.get.ts
+++ b/server/api/admin/backup/jobs/index.get.ts
@@ -9,21 +9,21 @@ import {
 import { isBackupRunnerBusy } from '../../../../utils/backup/runner'
 
 export default defineEventHandler(async (event) => {
-  await requireAdminAuth(event)
+  const user = await requireAdminAuth(event)
   if (getRunningBackupJob() && !isBackupRunnerBusy()) {
     recoverInterruptedBackupJobs()
   }
   const query = getQuery(event)
   const pageSize = Math.min(50, Math.max(1, Number(query.pageSize) || 10))
   const pageNum = Math.max(1, Number(query.pageNum) || Number(query.page) || 1)
-  const { jobs, total } = listBackupJobsPage(pageNum, pageSize)
+  const { jobs, total } = listBackupJobsPage(pageNum, pageSize, user.id)
   const totalPages = Math.max(1, Math.ceil(total / pageSize))
   const page = total > 0 ? Math.min(pageNum, totalPages) : 1
   const slice = page === pageNum
     ? jobs
-    : listBackupJobsPage(page, pageSize).jobs
+    : listBackupJobsPage(page, pageSize, user.id).jobs
 
-  const activeJob = getActiveBackupJob()
+  const activeJob = getActiveBackupJob(user.id)
 
   return {
     jobs: slice.map(serializeBackupJob),
diff --git a/server/api/admin/backup/restore.post.ts b/server/api/admin/backup/restore.post.ts
index a0c22dc..3445e38 100644
--- a/server/api/admin/backup/restore.post.ts
+++ b/server/api/admin/backup/restore.post.ts
@@ -4,13 +4,14 @@ import { createApiError } from '../../../utils/api-error'
 import { serializeBackupJob } from '../../../utils/backup/api'
 import { previewFullRestore } from '../../../utils/backup/full-restore'
 import { startFullRestoreJob } from '../../../utils/backup/runner'
+import { listAllBackupJobsForUser } from '../../../utils/backup/jobs'
 import {
   BACKUP_ARCHIVE_EXT,
   getBackupsDir,
   getBackupStagingDir,
   isSafeBackupFilename
 } from '../../../utils/backup/paths'
-import { join } from 'node:path'
+import { basename, join } from 'node:path'
 import { promises as fs } from 'node:fs'
 
 interface RestoreBody {
@@ -19,7 +20,7 @@ interface RestoreBody {
   dryRun?: boolean
 }
 
-async function resolveRestoreInput(event: H3Event): Promise<{
+async function resolveRestoreInput(event: H3Event, userId: number): Promise<{
   archivePath: string
   body: RestoreBody
   cleanup?: () => Promise<void>
@@ -71,6 +72,19 @@ async function resolveRestoreInput(event: H3Event): Promise<{
   if (!body?.archiveName || !isSafeBackupFilename(body.archiveName)) {
     createApiError(event, 'INVALID_REQUEST', '请选择有效的备份文件', 400)
   }
+  const allowedArchives = new Set(
+    listAllBackupJobsForUser(userId).flatMap((job) => {
+      const names: string[] = []
+      if (job.outputPath) names.push(basename(job.outputPath))
+      if (typeof job.payload.archivePath === 'string') {
+        names.push(basename(job.payload.archivePath))
+      }
+      return names
+    })
+  )
+  if (!allowedArchives.has(body.archiveName)) {
+    createApiError(event, 'INVALID_REQUEST', '备份文件不存在', 404)
+  }
   const archivePath = join(getBackupsDir(), body.archiveName)
   try {
     await fs.access(archivePath)
@@ -81,9 +95,9 @@ async function resolveRestoreInput(event: H3Event): Promise<{
 }
 
 export default defineEventHandler(async (event) => {
-  await requireAdminAuth(event)
+  const user = await requireAdminAuth(event)
 
-  const { archivePath, body, cleanup } = await resolveRestoreInput(event)
+  const { archivePath, body, cleanup } = await resolveRestoreInput(event, user.id)
 
   const conflictMode = body.conflictMode === 'skip' ? 'skip' : 'overwrite'
 
@@ -97,7 +111,7 @@ export default defineEventHandler(async (event) => {
   }
 
   try {
-    const job = startFullRestoreJob(archivePath, conflictMode)
+    const job = startFullRestoreJob(archivePath, conflictMode, user.id)
     return { job: serializeBackupJob(job) }
   } catch (error) {
     if (error instanceof Error && error.message === 'BACKUP_JOB_RUNNING') {
diff --git a/server/api/admin/storage/sync.post.ts b/server/api/admin/storage/sync.post.ts
index 6d2f48c..6da82a7 100644
--- a/server/api/admin/storage/sync.post.ts
+++ b/server/api/admin/storage/sync.post.ts
@@ -13,7 +13,7 @@ interface SyncBody {
 }
 
 export default defineEventHandler(async (event) => {
-  await requireAdminAuth(event)
+  const user = await requireAdminAuth(event)
   const body = await readBody<SyncBody>(event)
 
   const fromBackendId = body?.fromBackendId?.trim() ?? ''
@@ -36,7 +36,7 @@ export default defineEventHandler(async (event) => {
       return { preview }
     }
 
-    const job = startBackendSyncJob(options)
+    const job = startBackendSyncJob(options, user.id)
     return { job: serializeBackupJob(job) }
   } catch (error) {
     if (error instanceof Error) {
diff --git a/server/api/files/hls-mp4.post.ts b/server/api/files/hls-mp4.post.ts
new file mode 100644
index 0000000..2775403
--- /dev/null
+++ b/server/api/files/hls-mp4.post.ts
@@ -0,0 +1,81 @@
+import { createReadStream, promises as fs } from 'node:fs'
+import { randomUUID } from 'node:crypto'
+import { tmpdir } from 'node:os'
+import { join } from 'node:path'
+import { assertImageOwnership, requireUserAuth } from '../../utils/access'
+import { createApiError } from '../../utils/api-error'
+import { buildAttachmentDisposition } from '../../utils/file-bed'
+import { getImageIndexRow } from '../../utils/image-index'
+import { validateVideoKey } from '../../utils/image-key'
+import { logException, logInfo } from '../../utils/logger'
+import {
+  cleanupExpiredHlsDownloads,
+  markHlsDownloadForCleanup,
+  remuxHlsToMp4
+} from '../../utils/transcode'
+
+interface DownloadBody {
+  key?: string
+}
+
+export default defineEventHandler(async (event) => {
+  const user = await requireUserAuth(event)
+
+  const body = await readBody<DownloadBody>(event).catch(() => null)
+  const key = body?.key
+  if (!key || !validateVideoKey(key)) {
+    createApiError(event, 'INVALID_VIDEO_KEY', '无效的视频路径', 400)
+  }
+
+  const row = getImageIndexRow(key)
+  if (!row?.hls_key) {
+    createApiError(event, 'HLS_NOT_FOUND', 'HLS 视频不存在或尚未转码完成', 404)
+  }
+  await assertImageOwnership(event, row.user_id)
+
+  void cleanupExpiredHlsDownloads()
+  const workDir = join(tmpdir(), `pichost-hls-download-${user.id}-${randomUUID()}`)
+  try {
+    await fs.mkdir(workDir, { recursive: true })
+    await markHlsDownloadForCleanup(workDir)
+  } catch (error) {
+    await fs.rm(workDir, { recursive: true, force: true }).catch(() => {})
+    throw error
+  }
+
+  let outputPath: string
+  try {
+    outputPath = await remuxHlsToMp4(row.hls_key, workDir)
+  } catch (error) {
+    await fs.rm(workDir, { recursive: true, force: true }).catch(() => {})
+    logException('HLS download remux failed', error, { key })
+    createApiError(event, 'HLS_REMUX_FAILED', '视频合并失败，请稍后重试', 500)
+  }
+
+  let outputSize: number
+  try {
+    const stat = await fs.stat(outputPath)
+    if (!stat.isFile() || stat.size === 0) {
+      createApiError(event, 'HLS_REMUX_FAILED', '视频合并失败，请稍后重试', 500)
+    }
+    outputSize = stat.size
+    await markHlsDownloadForCleanup(workDir)
+  } catch (error) {
+    await fs.rm(workDir, { recursive: true, force: true }).catch(() => {})
+    throw error
+  }
+
+  const baseName = row.original_name.replace(/\.[^.]+$/, '') || 'video'
+  setResponseHeader(event, 'Content-Type', 'video/mp4')
+  setResponseHeader(event, 'Content-Length', outputSize)
+  setResponseHeader(event, 'Cache-Control', 'no-store')
+  setResponseHeader(
+    event,
+    'Content-Disposition',
+    buildAttachmentDisposition(`${baseName}.mp4`)
+  )
+
+  logInfo('HLS download remuxed', { key, size: outputSize })
+  await sendStream(event, createReadStream(outputPath))
+  await fs.rm(workDir, { recursive: true, force: true }).catch(() => {})
+})
diff --git a/server/api/files/index.get.ts b/server/api/files/index.get.ts
index 38c35a0..1625391 100644
--- a/server/api/files/index.get.ts
+++ b/server/api/files/index.get.ts
@@ -1,3 +1,4 @@
+import type { H3Event } from 'h3'
 import type { FileListResponse } from '~/types/file'
 import type { MediaType, TranscodeStatus } from '../../utils/storage/types'
 import { requireApiOrAdminAuth, getImageUserFilter } from '../../utils/access'
@@ -21,7 +22,10 @@ import {
 } from '../../utils/image-query'
 import { listImages, searchImages } from '../../utils/storage'
 
-export default defineEventHandler(async (event) => {
+export async function handleFileList(
+  event: H3Event,
+  forcedKind?: MediaType
+): Promise<FileListResponse> {
   await requireApiOrAdminAuth(event)
 
   const query = getQuery(event)
@@ -51,7 +55,7 @@ export default defineEventHandler(async (event) => {
   }
 
   // 文件床按类型分工：视频库看 media_type=video，文件库看 media_type=file
-  const kindRaw = typeof query.kind === 'string' ? query.kind.trim() : ''
+  const kindRaw = forcedKind ?? (typeof query.kind === 'string' ? query.kind.trim() : '')
   if (kindRaw && kindRaw !== 'file' && kindRaw !== 'video') {
     createApiError(event, 'INVALID_REQUEST', '无效的文件类型筛选', 400)
   }
@@ -111,6 +115,7 @@ export default defineEventHandler(async (event) => {
       ...(uploadSource === 'web' || uploadSource === 'api' ? { uploadSource } : {}),
       transcodeStatus: stored.transcodeStatus ?? 'none',
       transcodeProgress: stored.transcodeProgress ?? 0,
+      ...(stored.transcodeError ? { transcodeError: stored.transcodeError } : {}),
       ...(stored.transcodePreset ? { transcodePreset: stored.transcodePreset } : {}),
       ...(stored.sourceDeleted ? { sourceDeleted: true } : {}),
       ...(stored.thumbKey
@@ -138,4 +143,6 @@ export default defineEventHandler(async (event) => {
   }
 
   return response
-})
+}
+
+export default defineEventHandler(handleFileList)
diff --git a/server/api/files/search.get.ts b/server/api/files/search.get.ts
new file mode 100644
index 0000000..2b375b9
--- /dev/null
+++ b/server/api/files/search.get.ts
@@ -0,0 +1,16 @@
+import { handleFileList } from './index.get'
+import { createApiError } from '../../utils/api-error'
+
+export default defineEventHandler(async (event) => {
+  const query = getQuery(event)
+  const search = typeof query.q === 'string' ? query.q.trim() : ''
+  if (!search) {
+    createApiError(event, 'INVALID_REQUEST', '搜索关键词不能为空', 400)
+  }
+
+  const kind = typeof query.kind === 'string' ? query.kind.trim() : 'file'
+  if (kind !== 'file' && kind !== 'video') {
+    createApiError(event, 'INVALID_REQUEST', '无效的文件类型筛选', 400)
+  }
+  return handleFileList(event)
+})
diff --git a/server/api/user/storage/purge.post.ts b/server/api/user/storage/purge.post.ts
new file mode 100644
index 0000000..11e29d7
--- /dev/null
+++ b/server/api/user/storage/purge.post.ts
@@ -0,0 +1,31 @@
+import { requireUserAuth } from '../../../utils/access'
+import { createApiError } from '../../../utils/api-error'
+import { logInfo } from '../../../utils/logger'
+import { clearUserStorage } from '../../../utils/user-storage'
+
+export default defineEventHandler(async (event) => {
+  const user = await requireUserAuth(event)
+  const body = await readBody<{ confirmation?: string }>(event).catch(() => null)
+  if (!['我已确认', 'I confirm'].includes(body?.confirmation?.trim() ?? '')) {
+    createApiError(event, 'INVALID_REQUEST', '请输入“我已确认”以继续', 400)
+  }
+
+  try {
+    const result = await clearUserStorage(user.id)
+    logInfo('user storage cleared', {
+      userId: user.id,
+      deletedMedia: result.deletedMedia,
+      deletedObjects: result.deletedObjects,
+      failed: result.failed.length
+    })
+    return result
+  } catch (error) {
+    if (error instanceof Error && error.message === 'USER_STORAGE_CLEAR_IN_PROGRESS') {
+      createApiError(event, 'CONFLICT', '清空存储任务正在执行，请勿重复操作', 409)
+    }
+    if (error instanceof Error && error.message === 'USER_STORAGE_CLEAR_ACTIVE_JOB') {
+      createApiError(event, 'CONFLICT', '当前有备份或迁移任务正在运行，请完成后再清空存储', 409)
+    }
+    throw error
+  }
+})
diff --git a/server/api/videos/search.get.ts b/server/api/videos/search.get.ts
new file mode 100644
index 0000000..309c382
--- /dev/null
+++ b/server/api/videos/search.get.ts
@@ -0,0 +1,11 @@
+import { handleFileList } from '../files/index.get'
+import { createApiError } from '../../utils/api-error'
+
+export default defineEventHandler(async (event) => {
+  const query = getQuery(event)
+  const search = typeof query.q === 'string' ? query.q.trim() : ''
+  if (!search) {
+    createApiError(event, 'INVALID_REQUEST', '搜索关键词不能为空', 400)
+  }
+  return handleFileList(event, 'video')
+})
diff --git a/server/api/videos/upload.post.ts b/server/api/videos/upload.post.ts
index 819c537..ee9ce43 100644
--- a/server/api/videos/upload.post.ts
+++ b/server/api/videos/upload.post.ts
@@ -10,7 +10,12 @@ import { MAX_FILES_PER_UPLOAD } from '../../utils/constants'
 import { createApiError } from '../../utils/api-error'
 import { checkUploadRateLimit } from '../../utils/rate-limit'
 import { processSingleVideoUpload } from '../../utils/file-bed'
-import { enqueueTranscode } from '../../utils/transcode'
+import {
+  enqueueTranscode,
+  MAX_TRANSCODE_BITRATE_PERCENT,
+  MIN_TRANSCODE_BITRATE_PERCENT,
+  parseTranscodePreset
+} from '../../utils/transcode'
 import { getFileBedAccessMode } from '../../utils/env'
 
 export default defineEventHandler(async (event) => {
@@ -37,6 +42,36 @@ export default defineEventHandler(async (event) => {
       )
     : false
 
+  const presetField = formData.find(part => part.name === 'transcodePreset')
+  const presetRaw = presetField?.data?.length
+    ? new TextDecoder().decode(presetField.data).trim()
+    : ''
+  const transcodePreset = presetRaw ? parseTranscodePreset(presetRaw) : undefined
+  if (presetRaw && !transcodePreset) {
+    createApiError(event, 'INVALID_REQUEST', '无效的转码质量档位', 400)
+  }
+
+  const bitrateField = formData.find(part => part.name === 'transcodeBitratePercent')
+  const bitrateRaw = bitrateField?.data?.length
+    ? new TextDecoder().decode(bitrateField.data).trim()
+    : ''
+  const transcodeBitratePercent = bitrateRaw ? Number(bitrateRaw) : undefined
+  if (
+    bitrateRaw
+    && (
+      !Number.isInteger(transcodeBitratePercent)
+      || transcodeBitratePercent! < MIN_TRANSCODE_BITRATE_PERCENT
+      || transcodeBitratePercent! > MAX_TRANSCODE_BITRATE_PERCENT
+    )
+  ) {
+    createApiError(
+      event,
+      'INVALID_REQUEST',
+      `转码目标码率需为 ${MIN_TRANSCODE_BITRATE_PERCENT}–${MAX_TRANSCODE_BITRATE_PERCENT} 的整数`,
+      400
+    )
+  }
+
   const fileParts = formData.filter(
     part => (part.name === 'file' || part.name === 'files' || part.name === 'video')
       && part.data?.length
@@ -82,7 +117,10 @@ export default defineEventHandler(async (event) => {
 
   if (wantTranscode) {
     for (const item of items) {
-      enqueueTranscode(item.key)
+      enqueueTranscode(item.key, {
+        ...(transcodePreset ? { preset: transcodePreset } : {}),
+        ...(transcodeBitratePercent !== undefined ? { bitratePercent: transcodeBitratePercent } : {})
+      })
     }
   }
 
diff --git a/server/cli/backup-export.mjs b/server/cli/backup-export.mjs
index 899ea28..5e082ec 100644
--- a/server/cli/backup-export.mjs
+++ b/server/cli/backup-export.mjs
@@ -11,9 +11,12 @@ import { readFileSync } from 'node:fs'
 import { join } from 'node:path'
 import { loadServerModule } from './backup-cli-loader.mjs'
 
-const { ensureBackupSchema } = loadServerModule('utils/backup/schema.ts')
-const { createBackupJob, getBackupJob } = loadServerModule('utils/backup/jobs.ts')
-const { runFullExportJob } = loadServerModule('utils/backup/full-export.ts')
+const {
+  ensureBackupSchema,
+  createBackupJob,
+  getBackupJob,
+  runFullExportJob
+} = loadServerModule('cli/backup-runtime.ts')
 
 function readAppVersion() {
   try {
diff --git a/server/cli/backup-restore.mjs b/server/cli/backup-restore.mjs
index b5fa7ed..209079c 100644
--- a/server/cli/backup-restore.mjs
+++ b/server/cli/backup-restore.mjs
@@ -11,10 +11,13 @@ import { access } from 'node:fs/promises'
 import { resolve } from 'node:path'
 import { loadServerModule } from './backup-cli-loader.mjs'
 
-const { ensureBackupSchema } = loadServerModule('utils/backup/schema.ts')
-const { createBackupJob, getBackupJob } = loadServerModule('utils/backup/jobs.ts')
-const { previewFullRestore } = loadServerModule('utils/backup/full-restore.ts')
-const { runFullRestoreJob } = loadServerModule('utils/backup/full-restore.ts')
+const {
+  ensureBackupSchema,
+  createBackupJob,
+  getBackupJob,
+  previewFullRestore,
+  runFullRestoreJob
+} = loadServerModule('cli/backup-runtime.ts')
 
 function usage() {
   console.error('Usage: backup-restore <archive-path> [--overwrite]')
@@ -41,7 +44,7 @@ async function main() {
 
   ensureBackupSchema()
   const preview = await previewFullRestore(archivePath)
-  console.log(`[PicHost] Preview: ${preview.imageCount} images, ${preview.newImages} new, ${preview.conflictingImages} conflicts`)
+  console.log(`[PicHost] Preview: ${preview.imageCount} media items, ${preview.newImages} new files, ${preview.conflictingImages} conflicting files`)
 
   const job = createBackupJob({
     type: 'full_restore',
diff --git a/server/cli/backup-runtime.ts b/server/cli/backup-runtime.ts
new file mode 100644
index 0000000..71e170c
--- /dev/null
+++ b/server/cli/backup-runtime.ts
@@ -0,0 +1,5 @@
+export { ensureBackupSchema } from '../utils/backup/schema'
+export { createBackupJob, getBackupJob } from '../utils/backup/jobs'
+export { runFullExportJob } from '../utils/backup/full-export'
+export { previewFullRestore, runFullRestoreJob } from '../utils/backup/full-restore'
+export { previewBackendSync, runBackendSyncJob } from '../utils/backup/backend-sync'
diff --git a/server/cli/storage-sync.mjs b/server/cli/storage-sync.mjs
index 8ea7b92..ab207df 100644
--- a/server/cli/storage-sync.mjs
+++ b/server/cli/storage-sync.mjs
@@ -1,5 +1,5 @@
 /**
- * Sync images between storage backends.
+ * Sync media files between storage backends.
  *
  * Usage:
  *   node server/cli/storage-sync.mjs --from <id> --to <id> [--delete-source] [--set-default] [--dry-run]
@@ -9,9 +9,13 @@
  */
 import { loadServerModule } from './backup-cli-loader.mjs'
 
-const { ensureBackupSchema } = loadServerModule('utils/backup/schema.ts')
-const { createBackupJob, getBackupJob } = loadServerModule('utils/backup/jobs.ts')
-const { previewBackendSync, runBackendSyncJob } = loadServerModule('utils/backup/backend-sync.ts')
+const {
+  ensureBackupSchema,
+  createBackupJob,
+  getBackupJob,
+  previewBackendSync,
+  runBackendSyncJob
+} = loadServerModule('cli/backup-runtime.ts')
 
 function usage() {
   console.error('Usage: storage-sync --from <backend-id> --to <backend-id> [--delete-source] [--set-default] [--dry-run]')
@@ -45,7 +49,7 @@ async function main() {
 
   if (dryRun) {
     const preview = previewBackendSync(options)
-    console.log(`[PicHost] Dry run: ${preview.imageCount} images, ${preview.imageBytes} bytes`)
+    console.log(`[PicHost] Dry run: ${preview.imageCount} media items, ${preview.imageBytes} bytes`)
     console.log(`[PicHost] From ${preview.fromBackendId} → ${preview.toBackendId}`)
     return
   }
diff --git a/server/plugins/hls-download-cleanup.ts b/server/plugins/hls-download-cleanup.ts
new file mode 100644
index 0000000..66b0e72
--- /dev/null
+++ b/server/plugins/hls-download-cleanup.ts
@@ -0,0 +1,11 @@
+import { cleanupExpiredHlsDownloads } from '../utils/transcode'
+
+export default defineNitroPlugin(() => {
+  const cleanup = () => {
+    void cleanupExpiredHlsDownloads()
+  }
+
+  cleanup()
+  const timer = setInterval(cleanup, 60_000)
+  timer.unref()
+})
diff --git a/server/plugins/startup.ts b/server/plugins/startup.ts
index 5f69d3f..fe1f79b 100644
--- a/server/plugins/startup.ts
+++ b/server/plugins/startup.ts
@@ -31,7 +31,11 @@ export default defineNitroPlugin(() => {
     try {
       const entries = await fs.readdir(tmpdir(), { withFileTypes: true })
       for (const entry of entries) {
-        if (!entry.isDirectory() || !entry.name.startsWith('pichost-hls-')) continue
+        if (
+          !entry.isDirectory()
+          || !entry.name.startsWith('pichost-hls-')
+          || entry.name.startsWith('pichost-hls-download-')
+        ) continue
         await fs.rm(join(tmpdir(), entry.name), { recursive: true, force: true })
           .catch(() => {})
       }
diff --git a/server/utils/backup/backend-sync.ts b/server/utils/backup/backend-sync.ts
index ed7ee1d..fc0a03f 100644
--- a/server/utils/backup/backend-sync.ts
+++ b/server/utils/backup/backend-sync.ts
@@ -1,18 +1,22 @@
 import { promises as fs } from 'node:fs'
-import { join } from 'node:path'
+import { basename, join } from 'node:path'
 import {
   createBackendInstance,
   getStorageBackendRow,
   setDefaultBackend
 } from '../storage-backends'
 import {
-  getImageIndexAsStored,
+  getImageIndexRow,
   listImageIndexRowsByBackend,
   updateImageBackendId
 } from '../image-index'
-import { createImageStream } from '../storage'
+import { contentTypeFromKey } from '../content-type'
+import { mediaTypeForKey } from '../image-key'
+import type { ImageIndexRow } from '../image-index'
+import type { StorageBackend } from '../storage/types'
 import { getBackupJob, markJobDone, markJobFailed, updateBackupJob } from './jobs'
 import { getBackupStagingDir } from './paths'
+import { collectMediaAssetKeys } from '../media-assets'
 
 export interface BackendSyncOptions {
   fromBackendId: string
@@ -63,6 +67,44 @@ async function streamToBuffer(stream: NodeJS.ReadableStream): Promise<Buffer> {
   return Buffer.concat(chunks)
 }
 
+async function syncMediaRow(
+  row: ImageIndexRow,
+  fromBackend: StorageBackend,
+  toBackend: StorageBackend,
+  deleteSource: boolean
+): Promise<void> {
+  const keys = await collectMediaAssetKeys(row, fromBackend)
+  if (!keys.length) throw new Error('没有可同步的文件对象')
+
+  for (const key of keys) {
+    const stored = await fromBackend.head(key)
+    if (!stored) throw new Error(`源文件不存在：${key}`)
+
+    const bytes = await streamToBuffer(await fromBackend.createStream(key))
+    const isPrimary = key === row.key
+    await toBackend.put(key, bytes, {
+      originalName: isPrimary ? row.original_name : basename(key),
+      uploadedAt: row.uploaded_at,
+      contentType: isPrimary ? row.content_type : contentTypeFromKey(key),
+      size: bytes.length,
+      userId: row.user_id,
+      mediaType: isPrimary ? mediaTypeForKey(key) : 'video'
+    })
+
+    if (!await toBackend.head(key)) {
+      throw new Error(`目标后端写入校验失败：${key}`)
+    }
+  }
+
+  updateImageBackendId(row.key, toBackend.id)
+
+  if (deleteSource) {
+    for (const key of keys) {
+      await fromBackend.delete(key)
+    }
+  }
+}
+
 export async function runBackendSyncJob(
   jobId: string,
   options: BackendSyncOptions
@@ -88,32 +130,13 @@ export async function runBackendSyncJob(
   updateBackupJob(jobId, {
     total: rows.length,
     progress: 0,
-    message: '正在同步图片…'
+    message: '正在同步文件…'
   })
 
   let processed = 0
   for (const row of rows) {
     try {
-      const stream = await createImageStream(row.key)
-      const bytes = await streamToBuffer(stream)
-      await toBackend.put(row.key, bytes, {
-        originalName: row.original_name,
-        uploadedAt: row.uploaded_at,
-        contentType: row.content_type,
-        size: row.size,
-        userId: row.user_id
-      })
-
-      const head = await toBackend.head(row.key)
-      if (!head) {
-        throw new Error('目标后端写入校验失败')
-      }
-
-      updateImageBackendId(row.key, options.toBackendId)
-
-      if (options.deleteSource) {
-        await fromBackend.delete(row.key)
-      }
+      await syncMediaRow(row, fromBackend, toBackend, Boolean(options.deleteSource))
     } catch (error) {
       failedKeys.push(row.key)
       await fs.mkdir(join(failedLogPath, '..'), { recursive: true }).catch(() => {})
@@ -136,7 +159,7 @@ export async function runBackendSyncJob(
   }
 
   if (failedKeys.length > 0) {
-    markJobFailed(jobId, `${failedKeys.length} 张图片同步失败`, `部分失败：${failedKeys.length}/${rows.length}`)
+    markJobFailed(jobId, `${failedKeys.length} 个文件同步失败`, `部分失败：${failedKeys.length}/${rows.length}`)
     updateBackupJob(jobId, {
       payload: { failedKeys, failedLogPath, preview }
     })
@@ -178,22 +201,10 @@ export async function retryFailedBackendSync(jobId: string): Promise<void> {
 
   const stillFailed: string[] = []
   for (const key of keys) {
-    const row = getImageIndexAsStored(key)
+    const row = getImageIndexRow(key)
     if (!row) continue
     try {
-      const stream = await createImageStream(key)
-      const bytes = await streamToBuffer(stream)
-      await toBackend.put(key, bytes, {
-        originalName: row.originalName,
-        uploadedAt: row.uploadedAt,
-        contentType: row.contentType,
-        size: row.size,
-        userId: row.userId
-      })
-      updateImageBackendId(key, toBackendId)
-      if (deleteSource) {
-        await fromBackend.delete(key)
-      }
+      await syncMediaRow(row, fromBackend, toBackend, deleteSource)
     } catch {
       stillFailed.push(key)
     }
@@ -205,7 +216,7 @@ export async function retryFailedBackendSync(jobId: string): Promise<void> {
       stillFailed.map(key => `${key}\tretry failed\n`).join(''),
       'utf8'
     )
-    throw new Error(`仍有 ${stillFailed.length} 张图片同步失败`)
+    throw new Error(`仍有 ${stillFailed.length} 个文件同步失败`)
   }
 
   await fs.rm(failedLogPath, { force: true }).catch(() => {})
diff --git a/server/utils/backup/full-export.test.ts b/server/utils/backup/full-export.test.ts
new file mode 100644
index 0000000..ff3c708
--- /dev/null
+++ b/server/utils/backup/full-export.test.ts
@@ -0,0 +1,106 @@
+import * as tar from 'tar'
+import { describe, expect, it } from 'vitest'
+import { ensureDefaultBackends } from '../storage-backends'
+import { getActiveBackend } from '../storage/resolver'
+import { putImage } from '../storage'
+import { updateImageThumb, updateImageTranscode } from '../image-index'
+import { createBackupJob, getBackupJob } from './jobs'
+import { runFullExportJob } from './full-export'
+import { runFullRestoreJob } from './full-restore'
+
+async function archiveEntries(path: string): Promise<string[]> {
+  const entries: string[] = []
+  await tar.t({
+    file: path,
+    onentry: (entry) => {
+      if (entry.type === 'File') entries.push(entry.path.replace(/^\.\//, ''))
+    }
+  })
+  return entries
+}
+
+describe('runFullExportJob', () => {
+  it('includes video source, thumbnail and HLS artifacts', async () => {
+    ensureDefaultBackends()
+    const key = 'videos/2026/10/backup-test.mp4'
+    const thumbKey = 'videos/2026/10/backup-test.webp'
+    const hlsKey = 'videos/2026/10/backup-test/index.m3u8'
+    const segmentKey = 'videos/2026/10/backup-test/seg000.ts'
+    const meta = {
+      originalName: 'backup-test.mp4',
+      uploadedAt: '2026-10-17T00:00:00.000Z',
+      contentType: 'video/mp4',
+      size: 1,
+      userId: 1,
+      mediaType: 'video' as const
+    }
+
+    await putImage(key, new Uint8Array([1]), meta)
+    const backend = await getActiveBackend()
+    await backend.put(thumbKey, new Uint8Array([2]), meta)
+    await backend.put(
+      hlsKey,
+      new TextEncoder().encode('#EXTM3U\n#EXTINF:6,\nseg000.ts\n'),
+      meta
+    )
+    await backend.put(segmentKey, new Uint8Array([3]), meta)
+    updateImageThumb(key, thumbKey)
+    updateImageTranscode(key, {
+      status: 'done',
+      hlsKey,
+      progress: 100
+    })
+
+    const job = createBackupJob({ type: 'full_export', message: 'test' })
+    await runFullExportJob(job.id, 'test')
+
+    const done = getBackupJob(job.id)
+    expect(done?.status).toBe('done')
+    const entries = await archiveEntries(done!.outputPath!)
+    expect(entries).toEqual(expect.arrayContaining([
+      'blobs/videos/2026/10/backup-test.mp4',
+      'blobs/videos/2026/10/backup-test.webp',
+      'blobs/videos/2026/10/backup-test/index.m3u8',
+      'blobs/videos/2026/10/backup-test/seg000.ts'
+    ]))
+  })
+
+  it('restores missing sidecar files in skip mode', async () => {
+    ensureDefaultBackends()
+    const key = 'videos/2026/10/restore-test.mp4'
+    const thumbKey = 'videos/2026/10/restore-test.webp'
+    const hlsKey = 'videos/2026/10/restore-test/index.m3u8'
+    const segmentKey = 'videos/2026/10/restore-test/seg000.ts'
+    const meta = {
+      originalName: 'restore-test.mp4',
+      uploadedAt: '2026-10-17T00:00:00.000Z',
+      contentType: 'video/mp4',
+      size: 1,
+      userId: 1,
+      mediaType: 'video' as const
+    }
+
+    await putImage(key, new Uint8Array([1]), meta)
+    const backend = await getActiveBackend()
+    await backend.put(thumbKey, new Uint8Array([2]), meta)
+    await backend.put(
+      hlsKey,
+      new TextEncoder().encode('#EXTM3U\n#EXTINF:6,\nseg000.ts\n'),
+      meta
+    )
+    await backend.put(segmentKey, new Uint8Array([3]), meta)
+    updateImageThumb(key, thumbKey)
+    updateImageTranscode(key, { status: 'done', hlsKey, progress: 100 })
+
+    const exportJob = createBackupJob({ type: 'full_export', message: 'test' })
+    await runFullExportJob(exportJob.id, 'test')
+    const archivePath = getBackupJob(exportJob.id)!.outputPath!
+
+    await backend.delete(segmentKey)
+    expect(await backend.head(segmentKey)).toBeNull()
+
+    const restoreJob = createBackupJob({ type: 'full_restore', message: 'test' })
+    await runFullRestoreJob(restoreJob.id, archivePath, { conflictMode: 'skip' })
+    expect(await backend.head(segmentKey)).not.toBeNull()
+  })
+})
diff --git a/server/utils/backup/full-export.ts b/server/utils/backup/full-export.ts
index 4074e35..76df70e 100644
--- a/server/utils/backup/full-export.ts
+++ b/server/utils/backup/full-export.ts
@@ -1,5 +1,5 @@
 import { createWriteStream, promises as fs } from 'node:fs'
-import { basename, join } from 'node:path'
+import { join } from 'node:path'
 import { pipeline } from 'node:stream/promises'
 import * as tar from 'tar'
 import { getImageTotals, listAllImageIndexRows } from '../image-index'
@@ -9,7 +9,7 @@ import {
 } from '../storage-backends'
 import { parseS3Config } from '../storage/s3'
 import { parseTelegramConfig } from '../storage/telegram'
-import { createImageStream } from '../storage'
+import { getBackendForKey } from '../storage/resolver'
 import { copyDatabaseSnapshot } from './db-snapshot'
 import { markJobDone, markJobFailed, updateBackupJob } from './jobs'
 import { BACKUP_FORMAT_VERSION, type BackupManifest, type StorageBackendMetaExport } from './manifest'
@@ -19,6 +19,7 @@ import {
   getBackupsDir
 } from './paths'
 import type { StorageBackendRow } from '../storage/types'
+import { collectMediaAssetKeys } from '../media-assets'
 
 function formatArchiveName(jobId: string): string {
   return `pichost-${jobId}${BACKUP_ARCHIVE_EXT}`
@@ -48,36 +49,15 @@ async function writeStreamToFile(stream: NodeJS.ReadableStream, filePath: string
   await pipeline(stream, createWriteStream(filePath))
 }
 
-async function streamToString(stream: NodeJS.ReadableStream): Promise<string> {
-  const chunks: Buffer[] = []
-  for await (const chunk of stream) {
-    chunks.push(Buffer.from(chunk as Uint8Array))
-  }
-  return Buffer.concat(chunks).toString('utf8')
-}
-
-/**
- * 源文件已按设计删除（转码完成）时，导出 HLS 播放列表、分片与封面。
- * 恢复端会遍历 blobs 目录原样还原，因此这里只需把附属文件写进去。
- */
-async function exportVideoSidecars(row: ImageIndexRow, stagingRoot: string): Promise<void> {
-  const keys: string[] = []
-  if (row.thumb_key) keys.push(row.thumb_key)
-
-  if (row.hls_key) {
-    keys.push(row.hls_key)
-    const dir = row.hls_key.slice(0, row.hls_key.lastIndexOf('/'))
-    const text = await streamToString(await createImageStream(row.hls_key))
-    for (const line of text.split('\n')) {
-      const name = line.trim()
-      if (!name || name.startsWith('#')) continue
-      keys.push(`${dir}/${basename(name)}`)
-    }
-  }
-
+async function exportMediaAssets(
+  row: ImageIndexRow,
+  stagingRoot: string
+): Promise<void> {
+  const backend = await getBackendForKey(row.key)
+  const keys = await collectMediaAssetKeys(row, backend)
   for (const key of keys) {
     await writeStreamToFile(
-      await createImageStream(key),
+      await backend.createStream(key),
       join(stagingRoot, 'blobs', key)
     )
   }
@@ -138,17 +118,10 @@ export async function runFullExportJob(jobId: string, appVersion: string): Promi
     for (const row of rows) {
       updateBackupJob(jobId, {
         progress: processed,
-        message: `正在导出图片 ${processed}/${totals.count + 1}…`
+        message: `正在导出文件 ${processed}/${totals.count + 1}…`
       })
 
-      if (Number(row.source_deleted ?? 0) === 1) {
-        // 转码完成的视频只有 HLS 产物与封面
-        await exportVideoSidecars(row, stagingRoot)
-      } else {
-        const blobPath = join(stagingRoot, 'blobs', row.key)
-        const stream = await createImageStream(row.key)
-        await writeStreamToFile(stream, blobPath)
-      }
+      await exportMediaAssets(row, stagingRoot)
       processed += 1
       updateBackupJob(jobId, { progress: processed })
     }
diff --git a/server/utils/backup/full-restore.ts b/server/utils/backup/full-restore.ts
index 9c8fb1a..00210e5 100644
--- a/server/utils/backup/full-restore.ts
+++ b/server/utils/backup/full-restore.ts
@@ -4,6 +4,7 @@ import { pipeline } from 'node:stream/promises'
 import * as tar from 'tar'
 import { getImageIndexRow } from '../image-index'
 import { getActiveBackend } from '../storage/resolver'
+import { contentTypeFromKey } from '../content-type'
 import { replaceDatabaseFromSnapshot } from './db-snapshot'
 import { markJobDone, markJobFailed, restoreBackupJobsAfterReplace, snapshotBackupJobs, updateBackupJob } from './jobs'
 import {
@@ -60,10 +61,11 @@ export async function previewFullRestore(archivePath: string): Promise<BackupRes
       blobFiles = []
     }
 
+    const backend = await getActiveBackend()
     let conflictingImages = 0
     for (const file of blobFiles) {
       const rel = relative(blobsRoot, file).replace(/\\/g, '/')
-      if (getImageIndexRow(rel)) {
+      if (await backend.head(rel)) {
         conflictingImages += 1
       }
     }
@@ -104,7 +106,7 @@ export async function runFullRestoreJob(
     restoreBackupJobsAfterReplace(preservedJobs)
     updateBackupJob(jobId, {
       status: 'running',
-      message: '正在恢复图片…',
+      message: '正在恢复文件…',
       progress: 0,
       total: 0
     })
@@ -112,7 +114,7 @@ export async function runFullRestoreJob(
     const blobsRoot = join(stagingRoot, 'blobs')
     const blobFiles = await walkFiles(blobsRoot)
     const total = blobFiles.length + 1
-    updateBackupJob(jobId, { total, progress: 1, message: '正在恢复图片…' })
+    updateBackupJob(jobId, { total, progress: 1, message: '正在恢复文件…' })
 
     const backend = await getActiveBackend()
     let processed = 1
@@ -120,8 +122,9 @@ export async function runFullRestoreJob(
     for (const file of blobFiles) {
       const key = relative(blobsRoot, file).replace(/\\/g, '/')
       const indexed = getImageIndexRow(key)
+      const exists = Boolean(await backend.head(key))
 
-      if (!indexed && options.conflictMode === 'skip') {
+      if (exists && options.conflictMode === 'skip') {
         processed += 1
         continue
       }
@@ -138,19 +141,19 @@ export async function runFullRestoreJob(
         : {
             originalName: key.split('/').pop() ?? key,
             uploadedAt: new Date().toISOString(),
-            contentType: 'application/octet-stream',
+            contentType: contentTypeFromKey(key),
             size: bytes.length,
             userId: null
           }
 
-      if (options.conflictMode === 'overwrite' || !indexed) {
+      if (options.conflictMode === 'overwrite' || !exists) {
         await backend.put(key, bytes, meta)
       }
 
       processed += 1
       updateBackupJob(jobId, {
         progress: processed,
-        message: `正在恢复图片 ${processed}/${total}…`
+        message: `正在恢复文件 ${processed}/${total}…`
       })
     }
 
@@ -159,7 +162,7 @@ export async function runFullRestoreJob(
     markJobDone(jobId, {
       message: '恢复完成，请重新登录并在存储页检查对象存储密钥',
       payload: {
-        restoredImages: blobFiles.length,
+        restoredFiles: blobFiles.length,
         manifest
       }
     })
diff --git a/server/utils/backup/jobs.ts b/server/utils/backup/jobs.ts
index 3aeb43d..104661a 100644
--- a/server/utils/backup/jobs.ts
+++ b/server/utils/backup/jobs.ts
@@ -1,5 +1,5 @@
 import { randomBytes } from 'node:crypto'
-import { getDb } from '../db'
+import { getDb, getPrimaryAdminUserId } from '../db'
 import { ensureBackupSchema } from './schema'
 
 export type BackupJobType = 'full_export' | 'full_restore' | 'backend_sync'
@@ -7,6 +7,7 @@ export type BackupJobStatus = 'pending' | 'running' | 'done' | 'failed'
 
 export interface BackupJob {
   id: string
+  userId: number | null
   type: BackupJobType
   status: BackupJobStatus
   progress: number
@@ -21,6 +22,7 @@ export interface BackupJob {
 
 interface BackupJobRow {
   id: string
+  user_id: number | null
   type: BackupJobType
   status: BackupJobStatus
   progress: number
@@ -43,6 +45,7 @@ function rowToJob(row: BackupJobRow): BackupJob {
   })()
   return {
     id: row.id,
+    userId: row.user_id ?? null,
     type: row.type,
     status: row.status,
     progress: row.progress,
@@ -62,33 +65,34 @@ function generateJobId(): string {
   return `${stamp}-${suffix}`
 }
 
-export function getRunningBackupJob(): BackupJob | null {
+export function getRunningBackupJob(userId?: number): BackupJob | null {
   ensureBackupSchema()
   const row = getDb().prepare(`
-    SELECT id, type, status, progress, total, message, payload_json,
+    SELECT id, user_id, type, status, progress, total, message, payload_json,
            output_path, error, created_at, finished_at
     FROM backup_jobs
-    WHERE status = 'running'
+    WHERE status = 'running'${userId === undefined ? '' : ' AND user_id = ?'}
     LIMIT 1
-  `).get() as BackupJobRow | undefined
+  `).get(...(userId === undefined ? [] : [userId])) as BackupJobRow | undefined
   return row ? rowToJob(row) : null
 }
 
-export function getActiveBackupJob(): BackupJob | null {
+export function getActiveBackupJob(userId?: number): BackupJob | null {
   ensureBackupSchema()
   const row = getDb().prepare(`
-    SELECT id, type, status, progress, total, message, payload_json,
+    SELECT id, user_id, type, status, progress, total, message, payload_json,
            output_path, error, created_at, finished_at
     FROM backup_jobs
-    WHERE status IN ('pending', 'running')
+    WHERE status IN ('pending', 'running')${userId === undefined ? '' : ' AND user_id = ?'}
     ORDER BY created_at DESC
     LIMIT 1
-  `).get() as BackupJobRow | undefined
+  `).get(...(userId === undefined ? [] : [userId])) as BackupJobRow | undefined
   return row ? rowToJob(row) : null
 }
 
 export function createBackupJob(input: {
   type: BackupJobType
+  userId?: number | null
   total?: number
   message?: string
   payload?: Record<string, unknown>
@@ -97,13 +101,15 @@ export function createBackupJob(input: {
   const id = generateJobId()
   const now = new Date().toISOString()
   const payloadJson = JSON.stringify(input.payload ?? {})
+  const userId = input.userId === undefined ? getPrimaryAdminUserId() : input.userId
 
   getDb().prepare(`
     INSERT INTO backup_jobs
-      (id, type, status, progress, total, message, payload_json, output_path, error, created_at, finished_at)
-    VALUES (?, ?, 'pending', 0, ?, ?, ?, NULL, NULL, ?, NULL)
+      (id, user_id, type, status, progress, total, message, payload_json, output_path, error, created_at, finished_at)
+    VALUES (?, ?, ?, 'pending', 0, ?, ?, ?, NULL, NULL, ?, NULL)
   `).run(
     id,
+    userId,
     input.type,
     input.total ?? 0,
     input.message ?? '',
@@ -114,43 +120,69 @@ export function createBackupJob(input: {
   return getBackupJob(id)!
 }
 
-export function getBackupJob(id: string): BackupJob | null {
+export function getBackupJob(id: string, userId?: number): BackupJob | null {
   ensureBackupSchema()
   const row = getDb().prepare(`
-    SELECT id, type, status, progress, total, message, payload_json,
+    SELECT id, user_id, type, status, progress, total, message, payload_json,
            output_path, error, created_at, finished_at
     FROM backup_jobs
-    WHERE id = ?
-  `).get(id) as BackupJobRow | undefined
+    WHERE id = ?${userId === undefined ? '' : ' AND user_id = ?'}
+  `).get(...(userId === undefined ? [id] : [id, userId])) as BackupJobRow | undefined
   return row ? rowToJob(row) : null
 }
 
-export function listBackupJobs(limit = 20): BackupJob[] {
-  return listBackupJobsPage(1, limit).jobs
+export function listBackupJobs(limit = 20, userId?: number): BackupJob[] {
+  return listBackupJobsPage(1, limit, userId).jobs
 }
 
-export function countBackupJobs(): number {
+export function countBackupJobs(userId?: number): number {
   ensureBackupSchema()
-  const row = getDb().prepare('SELECT COUNT(*) AS count FROM backup_jobs').get() as { count: number }
+  const row = getDb().prepare(`
+    SELECT COUNT(*) AS count FROM backup_jobs
+    ${userId === undefined ? '' : 'WHERE user_id = ?'}
+  `).get(...(userId === undefined ? [] : [userId])) as { count: number }
   return row.count
 }
 
-export function listBackupJobsPage(page = 1, pageSize = 10): { jobs: BackupJob[], total: number } {
+export function listBackupJobsPage(
+  page = 1,
+  pageSize = 10,
+  userId?: number
+): { jobs: BackupJob[], total: number } {
   ensureBackupSchema()
   const limit = Math.min(50, Math.max(1, pageSize))
   const safePage = Math.max(1, page)
   const offset = (safePage - 1) * limit
-  const total = countBackupJobs()
+  const total = countBackupJobs(userId)
   const rows = getDb().prepare(`
-    SELECT id, type, status, progress, total, message, payload_json,
+    SELECT id, user_id, type, status, progress, total, message, payload_json,
            output_path, error, created_at, finished_at
     FROM backup_jobs
+    ${userId === undefined ? '' : 'WHERE user_id = ?'}
     ORDER BY created_at DESC
     LIMIT ? OFFSET ?
-  `).all(limit, offset) as unknown as BackupJobRow[]
+  `).all(...(userId === undefined ? [limit, offset] : [userId, limit, offset])) as unknown as BackupJobRow[]
   return { jobs: rows.map(rowToJob), total }
 }
 
+export function listAllBackupJobsForUser(userId: number): BackupJob[] {
+  ensureBackupSchema()
+  const rows = getDb().prepare(`
+    SELECT id, user_id, type, status, progress, total, message, payload_json,
+           output_path, error, created_at, finished_at
+    FROM backup_jobs
+    WHERE user_id = ?
+    ORDER BY created_at DESC
+  `).all(userId) as unknown as BackupJobRow[]
+  return rows.map(rowToJob)
+}
+
+export function deleteBackupJobsForUser(userId: number): number {
+  ensureBackupSchema()
+  const result = getDb().prepare('DELETE FROM backup_jobs WHERE user_id = ?').run(userId)
+  return Number(result.changes ?? 0)
+}
+
 /** Capture live task history before a full restore swaps the database file. */
 export function snapshotBackupJobs(limit = 50): BackupJob[] {
   return listBackupJobs(limit)
@@ -165,12 +197,13 @@ export function restoreBackupJobsAfterReplace(preserved: BackupJob[]): void {
     db.prepare('DELETE FROM backup_jobs').run()
     const insert = db.prepare(`
       INSERT INTO backup_jobs
-        (id, type, status, progress, total, message, payload_json, output_path, error, created_at, finished_at)
-      VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
+        (id, user_id, type, status, progress, total, message, payload_json, output_path, error, created_at, finished_at)
+      VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
     `)
     for (const job of preserved) {
       insert.run(
         job.id,
+        job.userId,
         job.type,
         job.status,
         job.progress,
diff --git a/server/utils/backup/runner.ts b/server/utils/backup/runner.ts
index 892b3e8..6df0ec6 100644
--- a/server/utils/backup/runner.ts
+++ b/server/utils/backup/runner.ts
@@ -70,10 +70,11 @@ export function scheduleBackupJob(
   })
 }
 
-export function startFullExportJob(appVersion: string): BackupJob {
+export function startFullExportJob(appVersion: string, userId?: number | null): BackupJob {
   claimJobSlot()
   const job = createBackupJob({
     type: 'full_export',
+    userId,
     message: '等待开始…'
   })
   scheduleBackupJob(job, () => runFullExportJob(job.id, appVersion))
@@ -82,11 +83,13 @@ export function startFullExportJob(appVersion: string): BackupJob {
 
 export function startFullRestoreJob(
   archivePath: string,
-  conflictMode: 'skip' | 'overwrite'
+  conflictMode: 'skip' | 'overwrite',
+  userId?: number | null
 ): BackupJob {
   claimJobSlot()
   const job = createBackupJob({
     type: 'full_restore',
+    userId,
     message: '等待开始…',
     payload: { archivePath, conflictMode }
   })
@@ -100,10 +103,11 @@ export function startBackendSyncJob(options: {
   deleteSource?: boolean
   setDefault?: boolean
   dryRun?: boolean
-}): BackupJob {
+}, userId?: number | null): BackupJob {
   claimJobSlot()
   const job = createBackupJob({
     type: 'backend_sync',
+    userId,
     message: options.dryRun ? '预检中…' : '等待开始…',
     payload: options
   })
diff --git a/server/utils/backup/schema.ts b/server/utils/backup/schema.ts
index 81fc03f..2cff10c 100644
--- a/server/utils/backup/schema.ts
+++ b/server/utils/backup/schema.ts
@@ -4,6 +4,7 @@ export function ensureBackupSchema(): void {
   getDb().exec(`
     CREATE TABLE IF NOT EXISTS backup_jobs (
       id TEXT PRIMARY KEY,
+      user_id INTEGER,
       type TEXT NOT NULL CHECK(type IN ('full_export', 'full_restore', 'backend_sync')),
       status TEXT NOT NULL CHECK(status IN ('pending', 'running', 'done', 'failed')),
       progress INTEGER NOT NULL DEFAULT 0,
@@ -18,4 +19,21 @@ export function ensureBackupSchema(): void {
     CREATE INDEX IF NOT EXISTS idx_backup_jobs_created_at
       ON backup_jobs(created_at DESC);
   `)
+
+  const columns = getDb().prepare('PRAGMA table_info(backup_jobs)').all() as Array<{
+    name: string
+  }>
+  if (!columns.some(column => column.name === 'user_id')) {
+    getDb().exec('ALTER TABLE backup_jobs ADD COLUMN user_id INTEGER')
+  }
+  getDb().exec(`
+    CREATE INDEX IF NOT EXISTS idx_backup_jobs_user_created
+      ON backup_jobs(user_id, created_at DESC);
+    UPDATE backup_jobs
+    SET user_id = (
+      SELECT id FROM users WHERE role = 'admin' ORDER BY id LIMIT 1
+    )
+    WHERE user_id IS NULL
+      AND EXISTS (SELECT 1 FROM users WHERE role = 'admin');
+  `)
 }
diff --git a/server/utils/constants.ts b/server/utils/constants.ts
index 605aa7c..dbfebf8 100644
--- a/server/utils/constants.ts
+++ b/server/utils/constants.ts
@@ -38,9 +38,7 @@ export const VIDEO_EXTENSIONS = [
   'flv',
   'wmv',
   'mpg',
-  'mpeg',
-  'ts',
-  'm3u8'
+  'mpeg'
 ] as const
 
 /** 文件床直链缓存：公开访问可长期缓存，Token 访问不能进共享缓存 */
diff --git a/server/utils/file-bed.test.ts b/server/utils/file-bed.test.ts
index 545e678..44b1072 100644
--- a/server/utils/file-bed.test.ts
+++ b/server/utils/file-bed.test.ts
@@ -131,6 +131,11 @@ describe('isVideoExtension', () => {
     expect(isVideoExtension('mkv')).toBe(true)
   })
 
+  it('rejects HLS sidecars from the user upload allowlist', () => {
+    expect(isVideoExtension('ts')).toBe(false)
+    expect(isVideoExtension('m3u8')).toBe(false)
+  })
+
   it('rejects non-video extensions', () => {
     expect(isVideoExtension('png')).toBe(false)
     expect(isVideoExtension('pdf')).toBe(false)
@@ -153,6 +158,8 @@ describe('validateVideoKey', () => {
 
   it('is covered by validateStorageKey', () => {
     expect(validateStorageKey('videos/2026/10/a.mp4')).toBe(true)
+    expect(validateStorageKey('videos/2026/10/a/index.m3u8')).toBe(true)
+    expect(validateStorageKey('videos/2026/10/a/seg000.ts')).toBe(true)
   })
 })
 
diff --git a/server/utils/image-index.ts b/server/utils/image-index.ts
index 7f202e1..413a3ac 100644
--- a/server/utils/image-index.ts
+++ b/server/utils/image-index.ts
@@ -45,6 +45,7 @@ export interface ImageIndexRow {
   thumb_key: string | null
   source_deleted: number
   transcode_preset: string | null
+  transcode_error: string | null
 }
 
 function keyToFilePath(key: string): string {
@@ -76,6 +77,7 @@ function rowToStoredImage(row: ImageIndexRow): StoredImage {
     thumbKey: row.thumb_key ?? null,
     sourceDeleted: Number(row.source_deleted ?? 0) === 1,
     transcodePreset: row.transcode_preset ?? null,
+    transcodeError: row.transcode_error ?? null,
     mtimeMs: Number.isFinite(uploadedMs) ? uploadedMs : Date.now()
   }
 }
@@ -230,7 +232,7 @@ export async function purgeOrphanImageIndexRows(): Promise<number> {
 export function getImageIndexRow(key: string): ImageIndexRow | null {
   ensureStorageSchema()
   const row = getDb().prepare(`
-    SELECT key, backend_id, user_id, folder, original_name, content_type, size, uploaded_at, hls_key, transcode_status, transcode_progress, thumb_key, source_deleted, transcode_preset
+    SELECT key, backend_id, user_id, folder, original_name, content_type, size, uploaded_at, hls_key, transcode_status, transcode_progress, thumb_key, source_deleted, transcode_preset, transcode_error
     FROM images
     WHERE key = ?
   `).get(key) as ImageIndexRow | undefined
@@ -423,16 +425,26 @@ export function getImageTotals(): { count: number, bytes: number } {
 export function listAllImageIndexRows(): ImageIndexRow[] {
   ensureStorageSchema()
   return getDb().prepare(`
-    SELECT key, backend_id, user_id, folder, original_name, content_type, size, uploaded_at, hls_key, transcode_status, transcode_progress, thumb_key, source_deleted, transcode_preset
+    SELECT key, backend_id, user_id, folder, original_name, content_type, size, uploaded_at, hls_key, transcode_status, transcode_progress, thumb_key, source_deleted, transcode_preset, transcode_error
     FROM images
     ORDER BY key ASC
   `).all() as unknown as ImageIndexRow[]
 }
 
+export function listImageIndexRowsForUser(userId: number): ImageIndexRow[] {
+  ensureStorageSchema()
+  return getDb().prepare(`
+    SELECT key, backend_id, user_id, folder, original_name, content_type, size, uploaded_at, hls_key, transcode_status, transcode_progress, thumb_key, source_deleted, transcode_preset, transcode_error
+    FROM images
+    WHERE user_id = ?
+    ORDER BY key ASC
+  `).all(userId) as unknown as ImageIndexRow[]
+}
+
 export function listImageIndexRowsByBackend(backendId: string): ImageIndexRow[] {
   ensureStorageSchema()
   return getDb().prepare(`
-    SELECT key, backend_id, user_id, folder, original_name, content_type, size, uploaded_at, hls_key, transcode_status, transcode_progress, thumb_key, source_deleted, transcode_preset
+    SELECT key, backend_id, user_id, folder, original_name, content_type, size, uploaded_at, hls_key, transcode_status, transcode_progress, thumb_key, source_deleted, transcode_preset, transcode_error
     FROM images
     WHERE backend_id = ?
     ORDER BY key ASC
@@ -456,6 +468,7 @@ export function updateImageTranscode(
     sourceDeleted?: boolean
     size?: number
     preset?: string | null
+    error?: string | null
   }
 ): void {
   ensureStorageSchema()
@@ -466,7 +479,8 @@ export function updateImageTranscode(
         transcode_progress = COALESCE(?, transcode_progress),
         source_deleted = COALESCE(?, source_deleted),
         size = COALESCE(?, size),
-        transcode_preset = COALESCE(?, transcode_preset)
+        transcode_preset = COALESCE(?, transcode_preset),
+        transcode_error = ?
     WHERE key = ?
   `).run(
     input.status,
@@ -475,19 +489,23 @@ export function updateImageTranscode(
     input.sourceDeleted === undefined ? null : (input.sourceDeleted ? 1 : 0),
     input.size ?? null,
     input.preset ?? null,
+    input.error ?? null,
     key
   )
 }
 
 /** 启动时恢复被中断的转码任务 */
-export function listPendingTranscodeKeys(): string[] {
+export function listPendingTranscodeRows(): Array<{
+  key: string
+  preset: string | null
+}> {
   ensureStorageSchema()
   const rows = getDb().prepare(`
-    SELECT key FROM images
+    SELECT key, transcode_preset FROM images
     WHERE media_type = 'video' AND transcode_status IN ('pending', 'running')
     ORDER BY uploaded_at ASC
-  `).all() as Array<{ key: string }>
-  return rows.map(row => row.key)
+  `).all() as Array<{ key: string, transcode_preset: string | null }>
+  return rows.map(row => ({ key: row.key, preset: row.transcode_preset }))
 }
 
 /** 转码已完成但仍保留源文件的视频（用于补删历史遗留） */
@@ -669,7 +687,7 @@ export async function listImages(options: {
   const backendSql = buildBackendFilterSql(options.backendId, params)
   const tagSql = buildTagFilterSql(options.tagFilter, params)
   const rows = getDb().prepare(`
-    SELECT key, backend_id, user_id, folder, original_name, content_type, size, uploaded_at, hls_key, transcode_status, transcode_progress, thumb_key, source_deleted, transcode_preset
+    SELECT key, backend_id, user_id, folder, original_name, content_type, size, uploaded_at, hls_key, transcode_status, transcode_progress, thumb_key, source_deleted, transcode_preset, transcode_error
     FROM images
     WHERE ${clauses.join(' AND ')}${userSql}${backendSql}${tagSql}
     ORDER BY uploaded_at DESC, key DESC
@@ -715,7 +733,7 @@ export async function searchImages(options: {
   const backendSql = buildBackendFilterSql(options.backendId, params)
   const tagSql = buildTagFilterSql(options.tagFilter, params)
   const rows = getDb().prepare(`
-    SELECT key, backend_id, user_id, folder, original_name, content_type, size, uploaded_at, hls_key, transcode_status, transcode_progress, thumb_key, source_deleted, transcode_preset
+    SELECT key, backend_id, user_id, folder, original_name, content_type, size, uploaded_at, hls_key, transcode_status, transcode_progress, thumb_key, source_deleted, transcode_preset, transcode_error
     FROM images
     WHERE ${clauses.join(' AND ')}${userSql}${backendSql}${tagSql}
     ORDER BY uploaded_at DESC, key DESC
@@ -849,7 +867,7 @@ export async function getUserScopedStorageStats(
 export async function listImageKeysForAutoDelete(): Promise<StoredImage[]> {
   ensureStorageSchema()
   const rows = getDb().prepare(`
-    SELECT key, backend_id, user_id, folder, original_name, content_type, size, uploaded_at, hls_key, transcode_status, transcode_progress, thumb_key, source_deleted, transcode_preset
+    SELECT key, backend_id, user_id, folder, original_name, content_type, size, uploaded_at, hls_key, transcode_status, transcode_progress, thumb_key, source_deleted, transcode_preset, transcode_error
     FROM images
     WHERE media_type = 'image'
     ORDER BY uploaded_at ASC
diff --git a/server/utils/media-assets.test.ts b/server/utils/media-assets.test.ts
new file mode 100644
index 0000000..da47c9a
--- /dev/null
+++ b/server/utils/media-assets.test.ts
@@ -0,0 +1,67 @@
+import { describe, expect, it } from 'vitest'
+import { LocalStorageBackend } from './storage/local'
+import type { ImageIndexRow } from './image-index'
+import { collectMediaAssetKeys } from './media-assets'
+
+const row: ImageIndexRow = {
+  key: 'videos/2026/10/example.mp4',
+  backend_id: 'local',
+  user_id: 1,
+  folder: 'videos',
+  original_name: 'example.mp4',
+  content_type: 'video/mp4',
+  size: 100,
+  uploaded_at: '2026-10-17T00:00:00.000Z',
+  hls_key: 'videos/2026/10/example/index.m3u8',
+  transcode_status: 'done',
+  transcode_progress: 100,
+  thumb_key: 'videos/2026/10/example.webp',
+  source_deleted: 0,
+  transcode_preset: 'veryfast',
+  transcode_error: null
+}
+
+async function createBackend() {
+  const backend = new LocalStorageBackend()
+  const meta = {
+    originalName: 'example',
+    uploadedAt: row.uploaded_at,
+    contentType: 'application/octet-stream',
+    size: 0,
+    userId: row.user_id,
+    mediaType: 'video' as const
+  }
+  await backend.put(row.key, new Uint8Array([1]), meta)
+  await backend.put(row.thumb_key!, new Uint8Array([2]), meta)
+  await backend.put(
+    row.hls_key!,
+    new TextEncoder().encode('#EXTM3U\n#EXTINF:6,\nseg000.ts\n'),
+    meta
+  )
+  await backend.put('videos/2026/10/example/seg000.ts', new Uint8Array([3]), meta)
+  return backend
+}
+
+describe('collectMediaAssetKeys', () => {
+  it('includes source, thumbnail, playlist and HLS segments', async () => {
+    const backend = await createBackend()
+    expect(new Set(await collectMediaAssetKeys(row, backend))).toEqual(new Set([
+      row.key,
+      row.thumb_key,
+      row.hls_key,
+      'videos/2026/10/example/seg000.ts'
+    ]))
+  })
+
+  it('omits the source when transcoding already removed it', async () => {
+    const backend = await createBackend()
+    expect(new Set(await collectMediaAssetKeys({
+      ...row,
+      source_deleted: 1
+    }, backend))).toEqual(new Set([
+      row.thumb_key,
+      row.hls_key,
+      'videos/2026/10/example/seg000.ts'
+    ]))
+  })
+})
diff --git a/server/utils/media-assets.ts b/server/utils/media-assets.ts
new file mode 100644
index 0000000..e87d6ba
--- /dev/null
+++ b/server/utils/media-assets.ts
@@ -0,0 +1,36 @@
+import type { ImageIndexRow } from './image-index'
+import type { StorageBackend } from './storage/types'
+import { hlsSegmentNames } from './transcode'
+
+async function streamToString(stream: NodeJS.ReadableStream): Promise<string> {
+  const chunks: Buffer[] = []
+  for await (const chunk of stream) {
+    chunks.push(Buffer.from(chunk as Uint8Array))
+  }
+  return Buffer.concat(chunks).toString('utf8')
+}
+
+/** 一个媒体记录对应的全部存储对象，包括原文件、缩略图和 HLS 附属文件。 */
+export async function collectMediaAssetKeys(
+  row: ImageIndexRow,
+  backend: Pick<StorageBackend, 'createStream'>
+): Promise<string[]> {
+  const keys = new Set<string>()
+
+  if (Number(row.source_deleted ?? 0) !== 1) {
+    keys.add(row.key)
+  }
+  if (row.thumb_key) {
+    keys.add(row.thumb_key)
+  }
+  if (row.hls_key) {
+    keys.add(row.hls_key)
+    const dir = row.hls_key.slice(0, row.hls_key.lastIndexOf('/'))
+    const playlist = await streamToString(await backend.createStream(row.hls_key))
+    for (const name of hlsSegmentNames(playlist)) {
+      keys.add(`${dir}/${name}`)
+    }
+  }
+
+  return [...keys]
+}
diff --git a/server/utils/storage-backends.ts b/server/utils/storage-backends.ts
index 7d98a54..3cbcb62 100644
--- a/server/utils/storage-backends.ts
+++ b/server/utils/storage-backends.ts
@@ -94,6 +94,7 @@ const STORAGE_SCHEMA_TRANSCODE_PROGRESS_KEY = 'storage_schema_transcode_progress
 const STORAGE_SCHEMA_THUMB_KEY = 'storage_schema_thumb'
 const STORAGE_SCHEMA_SOURCE_DELETED_KEY = 'storage_schema_source_deleted'
 const STORAGE_SCHEMA_TRANSCODE_PRESET_KEY = 'storage_schema_transcode_preset'
+const STORAGE_SCHEMA_TRANSCODE_ERROR_KEY = 'storage_schema_transcode_error'
 
 /** images 表新增 media_type 列（区分图床图片与文件床文件） */
 function migrateImagesMediaType(database: DatabaseSync): void {
@@ -232,6 +233,27 @@ function migrateImagesTranscodePreset(database: DatabaseSync): void {
   `).run(STORAGE_SCHEMA_TRANSCODE_PRESET_KEY, new Date().toISOString())
 }
 
+/** images 表新增「转码失败原因」列 */
+function migrateImagesTranscodeError(database: DatabaseSync): void {
+  const migrated = database.prepare(`
+    SELECT value FROM settings WHERE key = ?
+  `).get(STORAGE_SCHEMA_TRANSCODE_ERROR_KEY) as { value?: string } | undefined
+
+  if (migrated?.value === '1') return
+
+  const columns = database.prepare('PRAGMA table_info(images)').all() as Array<{
+    name: string
+  }>
+  if (!columns.some(column => column.name === 'transcode_error')) {
+    database.exec('ALTER TABLE images ADD COLUMN transcode_error TEXT')
+  }
+
+  database.prepare(`
+    INSERT OR REPLACE INTO settings (key, value, updated_at)
+    VALUES (?, '1', ?)
+  `).run(STORAGE_SCHEMA_TRANSCODE_ERROR_KEY, new Date().toISOString())
+}
+
 function migrateStorageTables(database: DatabaseSync): void {
   database.exec(`
     CREATE TABLE IF NOT EXISTS storage_backends (
@@ -263,6 +285,7 @@ function migrateStorageTables(database: DatabaseSync): void {
       thumb_key TEXT,
       source_deleted INTEGER NOT NULL DEFAULT 0,
       transcode_preset TEXT,
+      transcode_error TEXT,
       FOREIGN KEY (backend_id) REFERENCES storage_backends(id)
     );
     CREATE INDEX IF NOT EXISTS idx_images_uploaded_at ON images(uploaded_at DESC);
@@ -284,6 +307,7 @@ function migrateStorageTables(database: DatabaseSync): void {
   migrateImagesThumb(database)
   migrateImagesSourceDeleted(database)
   migrateImagesTranscodePreset(database)
+  migrateImagesTranscodeError(database)
   database.exec(`
     CREATE INDEX IF NOT EXISTS idx_images_media_type ON images(media_type);
   `)
diff --git a/server/utils/storage/s3.ts b/server/utils/storage/s3.ts
index bb865d9..eeb291b 100644
--- a/server/utils/storage/s3.ts
+++ b/server/utils/storage/s3.ts
@@ -38,6 +38,15 @@ function contentTypeFromKey(key: string): string {
   }
 }
 
+function decodeMetadata(value: string | undefined): string | undefined {
+  if (!value) return value
+  try {
+    return decodeURIComponent(value)
+  } catch {
+    return value
+  }
+}
+
 export function buildObjectKey(prefix: string | undefined, key: string): string {
   const trimmed = prefix?.replace(/^\/+|\/+$/g, '') ?? ''
   return trimmed ? `${trimmed}/${key}` : key
@@ -125,7 +134,8 @@ export class S3StorageBackend implements StorageBackend {
       Body: bytes,
       ContentType: meta.contentType,
       Metadata: {
-        originalName: meta.originalName,
+        // S3 metadata headers must be ASCII-safe.
+        originalName: encodeURIComponent(meta.originalName),
         uploadedAt: meta.uploadedAt,
         userId: meta.userId != null ? String(meta.userId) : ''
       }
@@ -144,7 +154,7 @@ export class S3StorageBackend implements StorageBackend {
       const uploadedAt = response.Metadata?.uploadedat
         ?? response.LastModified?.toISOString()
         ?? new Date().toISOString()
-      const originalName = response.Metadata?.originalname
+      const originalName = decodeMetadata(response.Metadata?.originalname)
         ?? key.split('/').pop()
         ?? 'image'
       const userIdRaw = response.Metadata?.userid
diff --git a/server/utils/storage/types.ts b/server/utils/storage/types.ts
index 6a842bd..9d9c4be 100644
--- a/server/utils/storage/types.ts
+++ b/server/utils/storage/types.ts
@@ -25,6 +25,8 @@ export interface StoredImage extends StoredImageMeta {
   transcodeProgress?: number
   /** 本视频使用的转码档位 */
   transcodePreset?: string | null
+  /** 转码失败原因 */
+  transcodeError?: string | null
   /** 视频封面缩略图 key */
   thumbKey?: string | null
   /** 转码成功后源视频是否已删除 */
diff --git a/server/utils/transcode.test.ts b/server/utils/transcode.test.ts
index ebfbbf9..82dad93 100644
--- a/server/utils/transcode.test.ts
+++ b/server/utils/transcode.test.ts
@@ -1,13 +1,20 @@
+import { promises as fs } from 'node:fs'
+import { tmpdir } from 'node:os'
+import { join } from 'node:path'
 import { describe, expect, it } from 'vitest'
 import {
+  cleanupExpiredHlsDownloads,
   DEFAULT_TRANSCODE_CONCURRENCY,
   DEFAULT_TRANSCODE_PRESET,
   DEFAULT_TRANSCODE_THREADS,
   getTranscodeConcurrency,
   getTranscodeSettings,
+  hlsSegmentNames,
   hlsPlaylistKey,
+  markHlsDownloadForCleanup,
   parseTranscodePreset,
   setTranscodeSettings,
+  summarizeTranscodeFailure,
   thumbKeyFor
 } from './transcode'
 import { isVideoSidecarKey, mediaTypeForKey } from './image-key'
@@ -39,6 +46,44 @@ describe('isVideoSidecarKey', () => {
   })
 })
 
+describe('hlsSegmentNames', () => {
+  it('returns unique relative segment names and ignores tags', () => {
+    expect(hlsSegmentNames([
+      '#EXTM3U',
+      '#EXTINF:6,',
+      'seg000.ts',
+      '#EXTINF:6,',
+      'seg001.ts',
+      'seg000.ts'
+    ].join('\n'))).toEqual(['seg000.ts', 'seg001.ts'])
+  })
+
+  it('ignores absolute and traversal paths', () => {
+    expect(hlsSegmentNames([
+      '../secret.ts',
+      'https://example.com/video.ts',
+      'folder/seg.ts',
+      'seg.ts'
+    ].join('\n'))).toEqual(['seg.ts'])
+  })
+})
+
+describe('cleanupExpiredHlsDownloads', () => {
+  it('keeps fresh downloads and removes files after their marker expires', async () => {
+    const now = Date.now()
+    const fresh = await fs.mkdtemp(join(tmpdir(), 'pichost-hls-download-fresh-'))
+    const expired = await fs.mkdtemp(join(tmpdir(), 'pichost-hls-download-expired-'))
+
+    await markHlsDownloadForCleanup(fresh, now + 60_000)
+    await markHlsDownloadForCleanup(expired, now - 1)
+    await cleanupExpiredHlsDownloads(now)
+
+    await expect(fs.access(fresh)).resolves.toBeUndefined()
+    await expect(fs.access(expired)).rejects.toThrow()
+    await fs.rm(fresh, { recursive: true, force: true })
+  })
+})
+
 describe('mediaTypeForKey', () => {
   it('maps folders to media types', () => {
     expect(mediaTypeForKey('images/2026/10/a.webp')).toBe('image')
@@ -47,6 +92,18 @@ describe('mediaTypeForKey', () => {
   })
 })
 
+describe('summarizeTranscodeFailure', () => {
+  it('recognizes a missing FFmpeg binary', () => {
+    expect(summarizeTranscodeFailure(new Error('spawn ffmpeg ENOENT')))
+      .toBe('ffmpeg-missing')
+  })
+
+  it('maps other FFmpeg errors to unknown', () => {
+    const error = new Error(`first line\n${'invalid data '.repeat(20)}`)
+    expect(summarizeTranscodeFailure(error)).toBe('unknown')
+  })
+})
+
 describe('transcode settings', () => {
   it('defaults to one concurrent job with one thread', () => {
     expect(DEFAULT_TRANSCODE_CONCURRENCY).toBe(1)
diff --git a/server/utils/transcode.ts b/server/utils/transcode.ts
index 8da4844..ae7800b 100644
--- a/server/utils/transcode.ts
+++ b/server/utils/transcode.ts
@@ -5,10 +5,11 @@ import { randomUUID } from 'node:crypto'
 import { tmpdir } from 'node:os'
 import { basename, join } from 'node:path'
 import { pipeline } from 'node:stream/promises'
+import sharp from 'sharp'
 import { getDataDir } from './data-dir'
 import {
   listAllImageIndexRows,
-  listPendingTranscodeKeys,
+  listPendingTranscodeRows,
   listTranscodedSourceRows,
   updateImageTranscode
 } from './image-index'
@@ -37,6 +38,9 @@ import {
 
 /** HLS 分片时长（秒） */
 const HLS_SEGMENT_TIME = 6
+const HLS_DOWNLOAD_PREFIX = 'pichost-hls-download-'
+export const HLS_DOWNLOAD_RETENTION_MS = 60 * 60 * 1000
+const HLS_DOWNLOAD_MARKER = '.expires'
 
 export const DEFAULT_TRANSCODE_CONCURRENCY = 1
 export const DEFAULT_TRANSCODE_THREADS = 1
@@ -56,6 +60,21 @@ export const DEFAULT_TRANSCODE_BITRATE_PERCENT = 80
 export const MIN_TRANSCODE_BITRATE_PERCENT = 10
 export const MAX_TRANSCODE_BITRATE_PERCENT = 100
 
+export interface TranscodeJobOptions {
+  preset: TranscodePreset
+  bitratePercent: number
+}
+
+/** 将底层错误归纳成适合界面展示的简短原因 */
+export function summarizeTranscodeFailure(error: unknown): string {
+  const message = error instanceof Error ? error.message : String(error)
+  if (/spawn ffmpeg ENOENT|ffmpeg.*(not found|ENOENT)|ENOENT.*ffmpeg/i.test(message)) {
+    return 'ffmpeg-missing'
+  }
+  if (/permission denied/i.test(message)) return 'permission-denied'
+  return 'unknown'
+}
+
 export function getTranscodeBitratePercent(): number {
   return parseBoundedInt(
     getSetting(SETTINGS_TRANSCODE_BITRATE),
@@ -84,6 +103,21 @@ function parseBoundedInt(
   return value
 }
 
+function resolveTranscodeJobOptions(
+  options: Partial<TranscodeJobOptions> = {}
+): TranscodeJobOptions {
+  const settings = getTranscodeSettings()
+  const bitratePercent = Number.isInteger(options.bitratePercent)
+    && options.bitratePercent! >= MIN_TRANSCODE_BITRATE_PERCENT
+    && options.bitratePercent! <= MAX_TRANSCODE_BITRATE_PERCENT
+    ? options.bitratePercent!
+    : settings.bitratePercent
+  return {
+    preset: options.preset ?? settings.preset,
+    bitratePercent
+  }
+}
+
 export interface TranscodeSettings {
   concurrency: number
   threads: number
@@ -162,6 +196,19 @@ export function thumbKeyFor(videoKey: string): string {
   return `${stripExtension(videoKey)}.webp`
 }
 
+/** HLS 播放列表中的相对分片文件名 */
+export function hlsSegmentNames(playlistText: string): string[] {
+  const names = new Set<string>()
+  for (const line of playlistText.split('\n')) {
+    const name = line.trim()
+    if (!name || name.startsWith('#') || name === '.' || name === '..' || /[/\\]/.test(name)) {
+      continue
+    }
+    names.add(name)
+  }
+  return [...names]
+}
+
 function runThumbFfmpeg(inputPath: string, outputPath: string, seek: number): Promise<void> {
   return new Promise((resolve, reject) => {
     const child = spawn('ffmpeg', [
@@ -172,8 +219,7 @@ function runThumbFfmpeg(inputPath: string, outputPath: string, seek: number): Pr
       '-i', inputPath,
       '-frames:v', '1',
       '-vf', 'scale=640:-2',
-      '-c:v', 'libwebp',
-      '-quality', '80',
+      '-c:v', 'png',
       outputPath
     ], { windowsHide: true })
 
@@ -203,6 +249,7 @@ export async function generateVideoThumbnail(videoKey: string): Promise<string |
 
   const workDir = join(tmpdir(), `pichost-thumb-${randomUUID()}`)
   const inputPath = join(workDir, `input.${extensionOf(videoKey)}`)
+  const framePath = join(workDir, 'thumb.png')
   const outputPath = join(workDir, 'thumb.webp')
 
   await fs.mkdir(workDir, { recursive: true })
@@ -211,11 +258,12 @@ export async function generateVideoThumbnail(videoKey: string): Promise<string |
     await streamToFile(await createImageStream(videoKey), inputPath)
 
     try {
-      await runThumbFfmpeg(inputPath, outputPath, 1)
+      await runThumbFfmpeg(inputPath, framePath, 1)
     } catch {
-      await runThumbFfmpeg(inputPath, outputPath, 0)
+      await runThumbFfmpeg(inputPath, framePath, 0)
     }
 
+    await sharp(framePath).webp({ quality: 80 }).toFile(outputPath)
     const bytes = await fs.readFile(outputPath)
     const thumbKey = thumbKeyFor(videoKey)
     const backend = await getBackendForKey(videoKey)
@@ -318,9 +366,10 @@ function runFfmpeg(
   outputDir: string,
   sourceBitrate: number,
   sourceAudioBitrate: number,
+  options: TranscodeJobOptions,
   onProgressUs: (outTimeUs: number) => void
 ): Promise<void> {
-  const { preset, bitratePercent } = getTranscodeSettings()
+  const { preset, bitratePercent } = options
 
   // 音频不放大也不压缩：跟随源音轨码率（读不到时才用 128k）
   const audioBitrate = sourceAudioBitrate > 0
@@ -419,12 +468,96 @@ async function streamToString(stream: NodeJS.ReadableStream): Promise<string> {
   return Buffer.concat(chunks).toString('utf8')
 }
 
+function remuxPlaylistToMp4(inputPath: string, outputPath: string): Promise<void> {
+  return new Promise((resolve, reject) => {
+    const child = spawn('ffmpeg', [
+      '-hide_banner',
+      '-loglevel', 'error',
+      '-y',
+      '-i', inputPath,
+      '-c', 'copy',
+      '-movflags', '+faststart',
+      outputPath
+    ], { windowsHide: true })
+
+    let stderr = ''
+    child.stderr.on('data', (chunk) => {
+      stderr += String(chunk)
+    })
+    child.on('error', reject)
+    child.on('close', (code) => {
+      if (code === 0) {
+        resolve()
+        return
+      }
+      const detail = stderr.trim().split('\n').filter(Boolean).pop()
+      reject(new Error(detail || `ffmpeg 退出码 ${code}`))
+    })
+  })
+}
+
+/** 下载 HLS 清单和分片到临时目录，不转码，重新封装为 MP4 */
+export async function remuxHlsToMp4(playlistKey: string, workDir: string): Promise<string> {
+  if (!validateStorageKey(playlistKey) || !playlistKey.endsWith('.m3u8')) {
+    throw new Error('无效的 HLS 播放列表')
+  }
+
+  const playlistText = await streamToString(await createImageStream(playlistKey))
+  const segmentNames = hlsSegmentNames(playlistText)
+  if (!segmentNames.length) throw new Error('HLS 播放列表没有视频分片')
+
+  const dirKey = playlistKey.slice(0, playlistKey.lastIndexOf('/'))
+  await fs.mkdir(workDir, { recursive: true })
+  await fs.writeFile(join(workDir, 'index.m3u8'), playlistText)
+
+  for (const name of segmentNames) {
+    const segmentKey = `${dirKey}/${name}`
+    if (!validateStorageKey(segmentKey)) throw new Error('HLS 分片路径无效')
+    await streamToFile(await createImageStream(segmentKey), join(workDir, name))
+  }
+
+  const outputPath = join(workDir, 'video.mp4')
+  await remuxPlaylistToMp4(join(workDir, 'index.m3u8'), outputPath)
+  return outputPath
+}
+
+/** 标记 HLS 下载临时文件，满一小时后允许清理 */
+export async function markHlsDownloadForCleanup(
+  workDir: string,
+  expiresAt = Date.now() + HLS_DOWNLOAD_RETENTION_MS
+): Promise<void> {
+  await fs.writeFile(join(workDir, HLS_DOWNLOAD_MARKER), String(expiresAt))
+}
+
+/** 删除已经到达过期时间的 HLS 下载临时目录 */
+export async function cleanupExpiredHlsDownloads(now = Date.now()): Promise<number> {
+  let removed = 0
+  try {
+    const entries = await fs.readdir(tmpdir(), { withFileTypes: true })
+    for (const entry of entries) {
+      if (!entry.isDirectory() || !entry.name.startsWith(HLS_DOWNLOAD_PREFIX)) continue
+      const path = join(tmpdir(), entry.name)
+      const expiresAt = Number(
+        await fs.readFile(join(path, HLS_DOWNLOAD_MARKER), 'utf8').catch(() => '')
+      )
+      if (!Number.isFinite(expiresAt) || expiresAt > now) continue
+      await fs.rm(path, { recursive: true, force: true })
+      removed++
+    }
+  } catch {
+    // 清理失败不影响新下载
+  }
+  return removed
+}
+
 /** 把视频转成 HLS 并写入存储，返回播放列表 key 与产物总大小 */
 export async function transcodeVideoToHls(
-  videoKey: string
+  videoKey: string,
+  jobOptions?: Partial<TranscodeJobOptions>
 ): Promise<{ playlistKey: string, totalBytes: number }> {
   const stored = await headImage(videoKey)
   if (!stored) throw new Error('视频不存在')
+  const options = resolveTranscodeJobOptions(jobOptions)
 
   const workDir = join(tmpdir(), `pichost-hls-${randomUUID()}`)
   const inputPath = join(workDir, `input.${extensionOf(videoKey)}`)
@@ -445,17 +578,25 @@ export async function transcodeVideoToHls(
     const sourceAudioBitrate = await probeAudioBitrate(inputPath)
     let lastProgressAt = 0
 
-    await runFfmpeg(videoKey, inputPath, outputDir, sourceBitrate, sourceAudioBitrate, (outTimeUs) => {
-      if (!durationSec) return
-      const now = Date.now()
-      if (now - lastProgressAt < 1000) return
-      lastProgressAt = now
-      const percent = Math.round((outTimeUs / (durationSec * 1_000_000)) * 100)
-      updateImageTranscode(videoKey, {
-        status: 'running',
-        progress: Math.min(99, Math.max(1, percent))
-      })
-    })
+    await runFfmpeg(
+      videoKey,
+      inputPath,
+      outputDir,
+      sourceBitrate,
+      sourceAudioBitrate,
+      options,
+      (outTimeUs) => {
+        if (!durationSec) return
+        const now = Date.now()
+        if (now - lastProgressAt < 1000) return
+        lastProgressAt = now
+        const percent = Math.round((outTimeUs / (durationSec * 1_000_000)) * 100)
+        updateImageTranscode(videoKey, {
+          status: 'running',
+          progress: Math.min(99, Math.max(1, percent))
+        })
+      }
+    )
 
     const uploadedAt = new Date().toISOString()
 
@@ -503,10 +644,8 @@ export async function removeHlsArtifacts(videoKey: string): Promise<void> {
   const dirKey = stripExtension(videoKey)
   const text = await streamToString(await createImageStream(playlistKey))
 
-  for (const line of text.split('\n')) {
-    const name = line.trim()
-    if (!name || name.startsWith('#')) continue
-    const segmentKey = `${dirKey}/${basename(name)}`
+  for (const name of hlsSegmentNames(text)) {
+    const segmentKey = `${dirKey}/${name}`
     if (!validateStorageKey(segmentKey)) continue
     await deleteImage(segmentKey).catch(() => {})
   }
@@ -520,15 +659,20 @@ export async function removeHlsArtifacts(videoKey: string): Promise<void> {
   }
 }
 
-const queue: string[] = []
+interface QueuedTranscode extends TranscodeJobOptions {
+  videoKey: string
+}
+
+const queue: QueuedTranscode[] = []
 const queued = new Set<string>()
 let activeCount = 0
 
-async function processOne(videoKey: string): Promise<void> {
+async function processOne(job: QueuedTranscode): Promise<void> {
+  const { videoKey } = job
   updateImageTranscode(videoKey, { status: 'running' })
 
   try {
-    const { playlistKey, totalBytes } = await transcodeVideoToHls(videoKey)
+    const { playlistKey, totalBytes } = await transcodeVideoToHls(videoKey, job)
 
     // 转码成功后源文件不再需要，直接删除以节省空间
     const backend = await getBackendForKey(videoKey)
@@ -543,7 +687,10 @@ async function processOne(videoKey: string): Promise<void> {
     })
     logInfo('transcode done', { key: videoKey, hlsKey: playlistKey })
   } catch (error) {
-    updateImageTranscode(videoKey, { status: 'failed' })
+    updateImageTranscode(videoKey, {
+      status: 'failed',
+      error: summarizeTranscodeFailure(error)
+    })
     logException('transcode failed', error, { key: videoKey })
   }
 }
@@ -551,10 +698,11 @@ async function processOne(videoKey: string): Promise<void> {
 /** 按设置的并发数消费队列（默认 1，即串行） */
 function drain(): void {
   while (queue.length && activeCount < getTranscodeConcurrency()) {
-    const key = queue.shift()!
+    const job = queue.shift()!
+    const key = job.videoKey
     activeCount += 1
 
-    void processOne(key).finally(() => {
+    void processOne(job).finally(() => {
       activeCount -= 1
       queued.delete(key)
       drain()
@@ -562,25 +710,28 @@ function drain(): void {
   }
 }
 
-export function enqueueTranscode(videoKey: string): void {
+export function enqueueTranscode(
+  videoKey: string,
+  options: Partial<TranscodeJobOptions> = {}
+): void {
   if (!validateVideoKey(videoKey) || queued.has(videoKey)) return
+  const job = resolveTranscodeJobOptions(options)
   queued.add(videoKey)
-  queue.push(videoKey)
+  queue.push({ videoKey, ...job })
   // 记录本视频使用的档位，便于上传页展示
-  const preset = getTranscodeSettings().preset
   updateImageTranscode(videoKey, {
     status: 'pending',
     // 压缩档带上百分比，例如 compress:80
-    preset: preset === 'compress'
-      ? `compress:${getTranscodeBitratePercent()}`
-      : preset
+    preset: job.preset === 'compress'
+      ? `compress:${job.bitratePercent}`
+      : job.preset
   })
   drain()
 }
 
 /** 取消排队中或正在转码的任务（删除视频时调用） */
 export function cancelTranscode(videoKey: string): void {
-  const index = queue.indexOf(videoKey)
+  const index = queue.findIndex(job => job.videoKey === videoKey)
   if (index >= 0) queue.splice(index, 1)
   queued.delete(videoKey)
 
@@ -616,8 +767,14 @@ export async function cleanupTranscodedSources(): Promise<number> {
 
 /** 启动时把上次中断的任务重新排队 */
 export function resumePendingTranscodes(): void {
-  for (const key of listPendingTranscodeKeys()) {
-    enqueueTranscode(key)
+  for (const row of listPendingTranscodeRows()) {
+    const [presetName, bitrateRaw] = (row.preset ?? '').split(':')
+    const preset = parseTranscodePreset(presetName)
+    const bitratePercent = Number(bitrateRaw)
+    enqueueTranscode(row.key, {
+      ...(preset ? { preset } : {}),
+      ...(Number.isInteger(bitratePercent) ? { bitratePercent } : {})
+    })
   }
 }
 
diff --git a/server/utils/user-storage.test.ts b/server/utils/user-storage.test.ts
new file mode 100644
index 0000000..da63f87
--- /dev/null
+++ b/server/utils/user-storage.test.ts
@@ -0,0 +1,145 @@
+import { promises as fs } from 'node:fs'
+import { tmpdir } from 'node:os'
+import { join } from 'node:path'
+import { describe, expect, it } from 'vitest'
+import {
+  getDb,
+  insertActivityLog,
+  insertUser
+} from './db'
+import {
+  listImageIndexRowsForUser,
+  updateImageThumb,
+  updateImageTranscode
+} from './image-index'
+import { ensureDefaultBackends } from './storage-backends'
+import { getActiveBackend } from './storage/resolver'
+import { putImage } from './storage'
+import { createTag } from './tags'
+import { clearUserStorage } from './user-storage'
+import {
+  createBackupJob,
+  getBackupJob,
+  markJobDone
+} from './backup/jobs'
+import { getBackupsDir } from './backup/paths'
+
+describe('clearUserStorage', () => {
+  it('deletes only the selected user media, tags, logs and cache', async () => {
+    ensureDefaultBackends()
+    const now = new Date().toISOString()
+    const userA = insertUser({
+      username: 'clear-user-a',
+      passwordHash: 'hash-a',
+      role: 'user',
+      createdAt: now
+    })
+    const userB = insertUser({
+      username: 'clear-user-b',
+      passwordHash: 'hash-b',
+      role: 'user',
+      createdAt: now
+    })
+
+    const keyA = 'videos/2026/10/clear-a.mp4'
+    const thumbA = 'videos/2026/10/clear-a.webp'
+    const hlsA = 'videos/2026/10/clear-a/index.m3u8'
+    const segmentA = 'videos/2026/10/clear-a/seg000.ts'
+    const keyB = 'images/2026/10/clear-b.webp'
+    const videoMeta = {
+      originalName: 'clear-a.mp4',
+      uploadedAt: now,
+      contentType: 'video/mp4',
+      size: 1,
+      userId: userA,
+      mediaType: 'video' as const
+    }
+
+    await putImage(keyA, new Uint8Array([1]), videoMeta)
+    const backend = await getActiveBackend()
+    await backend.put(thumbA, new Uint8Array([2]), videoMeta)
+    await backend.put(
+      hlsA,
+      new TextEncoder().encode('#EXTM3U\n#EXTINF:6,\nseg000.ts\n'),
+      videoMeta
+    )
+    await backend.put(segmentA, new Uint8Array([3]), videoMeta)
+    updateImageThumb(keyA, thumbA)
+    updateImageTranscode(keyA, { status: 'done', hlsKey: hlsA, progress: 100 })
+
+    await putImage(keyB, new Uint8Array([4]), {
+      originalName: 'clear-b.webp',
+      uploadedAt: now,
+      contentType: 'image/webp',
+      size: 1,
+      userId: userB,
+      mediaType: 'image'
+    })
+
+    const tagA = createTag(userA, 'A tag')
+    const tagB = createTag(userB, 'B tag')
+    getDb().prepare('INSERT INTO image_tags (image_key, tag_id) VALUES (?, ?)').run(keyA, tagA.id)
+    getDb().prepare('INSERT INTO image_tags (image_key, tag_id) VALUES (?, ?)').run(keyB, tagB.id)
+    insertActivityLog({
+      action: 'upload',
+      key: keyA,
+      originalName: 'clear-a.mp4',
+      size: 1,
+      contentType: 'video/mp4',
+      source: 'web',
+      userId: userA
+    })
+    insertActivityLog({
+      action: 'upload',
+      key: keyB,
+      originalName: 'clear-b.webp',
+      size: 1,
+      contentType: 'image/webp',
+      source: 'web',
+      userId: userB
+    })
+    const cacheDir = await fs.mkdtemp(join(tmpdir(), `pichost-hls-download-${userA}-`))
+    const jobA = createBackupJob({ type: 'full_export', userId: userA })
+    const jobB = createBackupJob({ type: 'full_export', userId: userB })
+    const archiveA = join(getBackupsDir(), `clear-a-${jobA.id}.phost.tar.gz`)
+    const archiveB = join(getBackupsDir(), `clear-b-${jobB.id}.phost.tar.gz`)
+    await fs.mkdir(getBackupsDir(), { recursive: true })
+    await fs.writeFile(archiveA, 'a')
+    await fs.writeFile(archiveB, 'b')
+    markJobDone(jobA.id, { outputPath: archiveA })
+    markJobDone(jobB.id, { outputPath: archiveB })
+
+    const result = await clearUserStorage(userA)
+
+    expect(result.failed).toEqual([])
+    expect(result.deletedMedia).toBe(1)
+    expect(result.deletedObjects).toBe(4)
+    expect(result.deletedJobs).toBe(1)
+    expect(listImageIndexRowsForUser(userA)).toHaveLength(0)
+    expect(listImageIndexRowsForUser(userB)).toHaveLength(1)
+    expect(await backend.head(keyB)).not.toBeNull()
+    expect(await backend.head(keyA)).toBeNull()
+    expect(await backend.head(thumbA)).toBeNull()
+    expect(await backend.head(hlsA)).toBeNull()
+    expect(await backend.head(segmentA)).toBeNull()
+    await expect(fs.access(cacheDir)).rejects.toThrow()
+
+    const db = getDb()
+    expect(db.prepare('SELECT COUNT(*) AS count FROM tags WHERE user_id = ?').get(userA))
+      .toEqual({ count: 0 })
+    expect(db.prepare('SELECT COUNT(*) AS count FROM tags WHERE user_id = ?').get(userB))
+      .toEqual({ count: 1 })
+    expect(db.prepare('SELECT COUNT(*) AS count FROM activity_logs WHERE user_id = ?').get(userA))
+      .toEqual({ count: 0 })
+    expect(db.prepare('SELECT COUNT(*) AS count FROM activity_logs WHERE user_id = ?').get(userB))
+      .toEqual({ count: 1 })
+    expect(db.prepare('SELECT COUNT(*) AS count FROM image_tags WHERE image_key = ?').get(keyA))
+      .toEqual({ count: 0 })
+    expect(db.prepare('SELECT COUNT(*) AS count FROM image_tags WHERE image_key = ?').get(keyB))
+      .toEqual({ count: 1 })
+    expect(getBackupJob(jobA.id, userA)).toBeNull()
+    expect(getBackupJob(jobB.id, userB)).not.toBeNull()
+    await expect(fs.access(archiveA)).rejects.toThrow()
+    await expect(fs.access(archiveB)).resolves.toBeUndefined()
+  })
+})
diff --git a/server/utils/user-storage.ts b/server/utils/user-storage.ts
new file mode 100644
index 0000000..4302d62
--- /dev/null
+++ b/server/utils/user-storage.ts
@@ -0,0 +1,173 @@
+import { promises as fs } from 'node:fs'
+import { tmpdir } from 'node:os'
+import { basename, dirname, join, resolve } from 'node:path'
+import { getDb } from './db'
+import {
+  deleteImageIndex,
+  listImageIndexRowsForUser
+} from './image-index'
+import { getBackendForKey } from './storage/resolver'
+import type { StorageBackend } from './storage/types'
+import { cancelTranscode } from './transcode'
+import { collectMediaAssetKeys } from './media-assets'
+import {
+  deleteBackupJobsForUser,
+  getActiveBackupJob,
+  listAllBackupJobsForUser,
+  type BackupJob
+} from './backup/jobs'
+import {
+  getBackupsDir,
+  getBackupStagingDir,
+  isSafeBackupFilename
+} from './backup/paths'
+
+const activeUsers = new Set<number>()
+
+export interface ClearUserStorageResult {
+  deletedMedia: number
+  deletedObjects: number
+  deletedTags: number
+  deletedLogs: number
+  clearedCacheDirs: number
+  deletedJobs: number
+  failed: Array<{ key: string, message: string }>
+}
+
+async function deleteObject(
+  backend: StorageBackend,
+  key: string
+): Promise<boolean> {
+  if (!await backend.head(key)) return false
+  await backend.delete(key)
+  return true
+}
+
+async function clearHlsDownloadCache(userId: number): Promise<number> {
+  let removed = 0
+  const prefix = `pichost-hls-download-${userId}-`
+  try {
+    const entries = await fs.readdir(tmpdir(), { withFileTypes: true })
+    for (const entry of entries) {
+      if (!entry.isDirectory() || !entry.name.startsWith(prefix)) continue
+      await fs.rm(join(tmpdir(), entry.name), { recursive: true, force: true })
+      removed++
+    }
+  } catch {
+    // Cache cleanup failure does not affect the media cleanup result.
+  }
+  return removed
+}
+
+async function removeBackupJobArtifacts(job: BackupJob): Promise<void> {
+  await fs.rm(getBackupStagingDir(job.id), { recursive: true, force: true }).catch(() => {})
+
+  const paths = [
+    job.outputPath,
+    typeof job.payload.archivePath === 'string' ? job.payload.archivePath : null
+  ]
+  for (const path of paths) {
+    if (!path || !isSafeBackupFilename(basename(path))) continue
+    if (resolve(dirname(path)) !== resolve(getBackupsDir())) continue
+    await fs.rm(path, { force: true }).catch(() => {})
+  }
+}
+
+export async function clearUserStorage(userId: number): Promise<ClearUserStorageResult> {
+  if (activeUsers.has(userId)) {
+    throw new Error('USER_STORAGE_CLEAR_IN_PROGRESS')
+  }
+  activeUsers.add(userId)
+
+  const result: ClearUserStorageResult = {
+    deletedMedia: 0,
+    deletedObjects: 0,
+    deletedTags: 0,
+    deletedLogs: 0,
+    clearedCacheDirs: 0,
+    deletedJobs: 0,
+    failed: []
+  }
+
+  try {
+    if (getActiveBackupJob(userId)) {
+      throw new Error('USER_STORAGE_CLEAR_ACTIVE_JOB')
+    }
+
+    const backupJobs = listAllBackupJobsForUser(userId)
+    const rows = listImageIndexRowsForUser(userId)
+    for (const row of rows) {
+      try {
+        cancelTranscode(row.key)
+        const backend = await getBackendForKey(row.key)
+        let keys: string[]
+        try {
+          keys = await collectMediaAssetKeys(row, backend)
+        } catch {
+          keys = [
+            ...(Number(row.source_deleted ?? 0) !== 1 ? [row.key] : []),
+            ...(row.thumb_key ? [row.thumb_key] : []),
+            ...(row.hls_key ? [row.hls_key] : [])
+          ]
+        }
+
+        for (const key of new Set(keys)) {
+          if (await deleteObject(backend, key)) result.deletedObjects++
+        }
+        deleteImageIndex(row.key)
+        result.deletedMedia++
+      } catch (error) {
+        result.failed.push({
+          key: row.key,
+          message: error instanceof Error ? error.message : '删除失败'
+        })
+      }
+    }
+
+    const db = getDb()
+    db.prepare(`
+      DELETE FROM image_tags
+      WHERE image_key NOT IN (SELECT key FROM images)
+    `).run()
+
+    if (!result.failed.length) {
+      const tagCount = db.prepare('SELECT COUNT(*) AS count FROM tags WHERE user_id = ?')
+        .get(userId) as { count: number }
+      const logCount = db.prepare('SELECT COUNT(*) AS count FROM activity_logs WHERE user_id = ?')
+        .get(userId) as { count: number }
+
+      db.exec('BEGIN')
+      try {
+        db.prepare(`
+          DELETE FROM image_tags
+          WHERE tag_id IN (SELECT id FROM tags WHERE user_id = ?)
+        `).run(userId)
+        db.prepare('DELETE FROM tags WHERE user_id = ?').run(userId)
+        db.prepare('DELETE FROM activity_logs WHERE user_id = ?').run(userId)
+        db.prepare(`
+          UPDATE users
+          SET auto_delete_days = 0, auto_delete_enabled_at = NULL
+          WHERE id = ?
+        `).run(userId)
+        db.exec('COMMIT')
+        result.deletedTags = Number(tagCount.count)
+        result.deletedLogs = Number(logCount.count)
+      } catch (error) {
+        db.exec('ROLLBACK')
+        throw error
+      }
+    }
+
+    if (!result.failed.length) {
+      for (const job of backupJobs) {
+        await removeBackupJobArtifacts(job)
+      }
+      result.deletedJobs = deleteBackupJobsForUser(userId)
+    }
+
+    result.clearedCacheDirs = await clearHlsDownloadCache(userId)
+    return result
+  } finally {
+    activeUsers.delete(userId)
+  }
+}