diff --git a/docs/plans/2026-10-22-transcode-media-id-fix-ui.md b/docs/plans/2026-10-22-transcode-media-id-fix-ui.md
new file mode 100644
index 0000000..fc50d28
--- /dev/null
+++ b/docs/plans/2026-10-22-transcode-media-id-fix-ui.md
@@ -0,0 +1,18 @@
+# 转码媒资 ID 前端精度修复
+
+## 根因
+
+聚合接口把 Snowflake 媒资 ID 以字符串返回，但面板使用
+`Number(detail.mediaAssetId)`，超过 `2^53` 后发生精度丢失，手动转码请求了错误 ID。
+
+## 修复
+
+- 聚合响应中的 episodeId/mediaAssetId/taskId 类型改为字符串。
+- 父面板不再 Number 归一化，媒体 ID 校验改为字符串 `/\d+/`。
+- 手动转码、帧图分页 URL 原样传递字符串。
+- mediaAssetId 为空时禁用重新转码并展示明确空态。
+
+## 验证
+
+- 超 2^53 ID 字符串保持逐位一致。
+- `pnpm lint:eslint`、`pnpm build:dev`。
diff --git a/docs/plans/PROGRESS.md b/docs/plans/PROGRESS.md
index c714667..dc523d6 100644
--- a/docs/plans/PROGRESS.md
+++ b/docs/plans/PROGRESS.md
@@ -100,3 +100,54 @@ Build successful. Please see dist-dev directory
 
 解读：组件 props/emits、类型检查、ESLint 和开发构建全部通过；
 循环 chunk 为项目既有警告。轮询启停、接口路径、分页参数和 locales 文案未改变。
+
+## 2026-10-22 转码媒资 ID 前端精度修复
+
+- 分支：`feature/transcode-media-id-fix-ui`
+- 基线：`develop` / `origin/develop` = `a4893c3`
+
+已复现 `Number('2113150398670966786')` 变为 `2113150398670966800`。
+本次将媒资、任务 id 全链路按字符串处理，禁止 Number 转换；没有媒资时
+禁用重新转码并显示空态。
+
+```text
+$ node -e "const id='2113150398670966786'; console.log(String(Number(id)))"
+2113150398670966800
+```
+
+解读：Snowflake id 超过 JS 安全整数，字符串化后的 Number 已失真。
+
+### 实现
+
+- `EpisodeTranscodeItem` 的 episodeId/mediaAssetId/taskId，以及 rendition/thumbnail
+  相关 id 类型改为字符串。
+- 父面板使用 `detail.mediaAssetId` 原始字符串和正则校验，不再 Number 转换。
+- 手动转码与帧图分页接口原样传递字符串 id。
+- `mediaAssetId` 为空时按钮保持禁用，空态优先展示后端 errorMsg 原因。
+
+静态检查确认：
+
+```text
+$ rg -n "Number\([^\n]*mediaAssetId|mediaAssetId[^\n]*Number\(" \
+  src/views/contentManagement/upload src/api/admin
+（无匹配）
+```
+
+### 门禁
+
+```text
+$ pnpm lint:eslint
+> eslint --fix --ext .js,.ts,.vue ./src
+（0 error / 0 warning）
+
+$ pnpm ts:check
+> vue-tsc --noEmit --skipLibCheck
+（通过）
+
+$ pnpm build:dev
+ WARN  Circular chunk: element-plus -> vue-chunks -> element-plus.
+Build successful. Please see dist-dev directory
+```
+
+解读：字符串 id 链路、类型检查、ESLint 与开发构建均通过；
+循环 chunk 为项目既有警告。
diff --git a/src/api/admin/transcode.ts b/src/api/admin/transcode.ts
index f6d2e86..fe436fa 100644
--- a/src/api/admin/transcode.ts
+++ b/src/api/admin/transcode.ts
@@ -12,7 +12,7 @@ export const getEpisodeTranscodeApi = (episodeId: number | string) => {
 
 /** 按媒体分页读取帧图；页面切换时复用该接口。 */
 export const getMediaThumbnailsApi = (
-  mediaAssetId: number | string,
+  mediaAssetId: string,
   pageIndex: number,
   pageSize: number
 ) => {
@@ -23,7 +23,7 @@ export const getMediaThumbnailsApi = (
 }
 
 /** 手动触发或重转当前分集绑定的媒体。 */
-export const triggerMediaTranscodeApi = (mediaAssetId: number | string) => {
+export const triggerMediaTranscodeApi = (mediaAssetId: string) => {
   return request.post<TranscodeTriggerResult>({
     url: `/admin/media/${mediaAssetId}/transcode`
   })
diff --git a/src/api/admin/types.ts b/src/api/admin/types.ts
index ad9d02d..8a84f0f 100644
--- a/src/api/admin/types.ts
+++ b/src/api/admin/types.ts
@@ -249,7 +249,7 @@ export interface MediaTranscodeProfile {
 }
 
 export interface MediaRenditionItem {
-  id: number
+  id: string
   quality: string
   qualityName: string
   width: number
@@ -292,8 +292,8 @@ export interface MediaThumbnailSpriteInfo {
 }
 
 export interface MediaThumbnailResult {
-  mediaAssetId?: number | null
-  episodeId?: number | null
+  mediaAssetId?: string | null
+  episodeId?: string | null
   /** READY / FAILED / EMPTY / INVALID / NO_EPISODE */
   status: string
   errorMsg?: string
@@ -304,9 +304,9 @@ export interface MediaThumbnailResult {
 }
 
 export interface EpisodeTranscodeItem {
-  episodeId: number
-  mediaAssetId?: number | null
-  taskId?: number | null
+  episodeId: string
+  mediaAssetId?: string | null
+  taskId?: string | null
   status: string
   progress?: number
   retryCount?: number
@@ -316,7 +316,7 @@ export interface EpisodeTranscodeItem {
 }
 
 export interface TranscodeTriggerResult {
-  taskId: number
+  taskId: string
   status: string
 }
 
diff --git a/src/views/contentManagement/upload/EpisodeTranscodePanel.vue b/src/views/contentManagement/upload/EpisodeTranscodePanel.vue
index 72a8134..c123321 100644
--- a/src/views/contentManagement/upload/EpisodeTranscodePanel.vue
+++ b/src/views/contentManagement/upload/EpisodeTranscodePanel.vue
@@ -24,7 +24,7 @@ import {
 } from './episodeTranscodeUi'
 
 const props = defineProps<{
-  episodeId: number
+  episodeId: string | number
   active: boolean
 }>()
 
@@ -45,8 +45,8 @@ let pollTimer: ReturnType<typeof setTimeout> | null = null
 let requestSeq = 0
 let thumbnailSeq = 0
 
-const mediaAssetId = computed(() => Number(detail.value?.mediaAssetId || 0))
-const hasMedia = computed(() => mediaAssetId.value > 0)
+const mediaAssetId = computed(() => detail.value?.mediaAssetId || '')
+const hasMedia = computed(() => /^[1-9]\d*$/.test(mediaAssetId.value))
 const normalizedStatus = computed(() => String(detail.value?.status || '').toUpperCase())
 const renditions = computed(() => detail.value?.renditions || [])
 const isProcessing = computed(
diff --git a/src/views/contentManagement/upload/EpisodeTranscodeStatusPanel.vue b/src/views/contentManagement/upload/EpisodeTranscodeStatusPanel.vue
index c876a70..d562a42 100644
--- a/src/views/contentManagement/upload/EpisodeTranscodeStatusPanel.vue
+++ b/src/views/contentManagement/upload/EpisodeTranscodeStatusPanel.vue
@@ -47,7 +47,7 @@ const { t } = useI18n()
   </div>
   <el-empty
     v-else-if="detail && !view.hasMedia"
-    :description="t('episodeTranscode.noMedia')"
+    :description="detail.errorMsg || t('episodeTranscode.noMedia')"
     :image-size="72"
   />
   <template v-else-if="detail">