Recover a finished clip after the site drops the live job.

Saving the MP4 used to freeze Node, which made xAIGen unreachable and left the player empty even though the library already had the video.

Co-authored-by: Cursor <cursoragent@cursor.com>

server/utils/library.ts

@@ -1,5 +1,6 @@
 import { createHash } from 'node:crypto'
 import { existsSync, mkdirSync, readdirSync, readFileSync, renameSync, rmSync, writeFileSync, statSync, createReadStream, openSync, readSync, closeSync } from 'node:fs'
+import { writeFile } from 'node:fs/promises'
 import { join } from 'node:path'
 import { spawn } from 'node:child_process'
 import { randomBytes, scrypt, timingSafeEqual } from 'node:crypto'
@@ -1609,7 +1610,7 @@ export async function saveClip(params: {
   }
   mkdirSync(clipDir(params.ownerKey, clip.id), { recursive: true })
   const videoPath = clipVideoPath(params.ownerKey, clip.id)
-  writeFileSync(videoPath, params.video)
+  await writeFile(videoPath, params.video)
   await remuxFaststart(videoPath)
   if (params.segmentFirstFrame?.length && params.segmentFirstFrame.length >= 64) {
     const firstPath = clipFirstFramePath(params.ownerKey, clip.id)