Add retry logic with timeout to extractLastFrame to handle temporary file access issues in shot scripts

server/utils/ffmpeg.ts

@@ -70,6 +70,11 @@ export async function extractLastFrame(inputPath: string, outputPath: string) {
     throw new Error('Source video is missing')
   }
 
+  const maxTotalTimeMs = 5000
+  const start = Date.now()
+  let delayMs = 100
+
+  while (Date.now() - start < maxTotalTimeMs) {
     const attempts: string[][] = []
     try {
       const duration = await probeDuration(inputPath)
@@ -88,11 +93,19 @@ export async function extractLastFrame(inputPath: string, outputPath: string) {
         await runFfmpeg(args, 60000)
         if (existsSync(outputPath) && statSync(outputPath).size >= 64) return
       } catch {
-      // Try the next seek strategy.
+        // Try next strategy
       }
     }
 
-  throw new Error('Could not extract the last frame. The video looks incomplete — interrupting Comfy mid-encode usually causes this. Earlier saved parts are still in the library.')
+    const elapsed = Date.now() - start
+    if (elapsed >= maxTotalTimeMs) break
+
+    const wait = Math.min(delayMs, maxTotalTimeMs - elapsed)
+    await new Promise(resolve => setTimeout(resolve, wait))
+    delayMs = Math.min(delayMs * 2, maxTotalTimeMs - (Date.now() - start))
+  }
+
+  throw new Error('Could not extract the last frame within the timeout. The video may still be encoding or is incomplete.')
 }
 
 export async function extractFirstFrame(inputPath: string, outputPath: string) {