use source file for web video compression (#11090)

src/lib/media/video/compress.web.ts

@@ -36,8 +36,12 @@ export async function compressVideo(
     hasWebCodecs: hasWebCodecs(),
   })
 
-  const response = await fetch(asset.uri)
-  const blob = await response.blob()
+  /*
+   * Prefer the original File over re-fetching the blob URL. A fetch round
+   * trip copies the bytes and fails with a bare TypeError if the URL was
+   * revoked or the read fails - the top web compressFailed error class.
+   */
+  const blob = asset.file ?? (await (await fetch(asset.uri)).blob())
 
   const isGif = blob.type === 'image/gif'
   const hasCodecs = hasWebCodecs()

src/lib/media/video/telemetry.ts

@@ -26,6 +26,11 @@ function errorClass(e: unknown): string {
   return 'Unknown'
 }
 
+function errorMessage(e: unknown): string {
+  const message = e instanceof Error ? e.message : String(e)
+  return message.slice(0, 256)
+}
+
 export type VideoTelemetry = {
   readonly uploadId: string
   readonly engine: string
@@ -208,6 +213,7 @@ export function createVideoTelemetry({
         uploadId,
         engine,
         errorClass: errorClass(e),
+        errorMessage: errorMessage(e),
         elapsedMs: Date.now() - phaseStartedAt,
       })
       endTxn('error')