Use the parent clip last frame and new-segment join for extensions, not the stitched file's first frame. Show this account's library storage in Settings.

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

server/utils/ffmpeg.ts

@@ -59,6 +59,12 @@ function concatPath(filePath: string) {
   return filePath.replace(/\\/g, '/').replace(/'/g, "'\\''")
 }
 
+function assertFrameFile(path: string, kind: string) {
+  if (!existsSync(path) || statSync(path).size < 64) {
+    throw new Error(`Could not extract the ${kind}`)
+  }
+}
+
 export async function extractLastFrame(inputPath: string, outputPath: string) {
   if (!existsSync(inputPath)) {
     throw new Error('Source video is missing')
@@ -80,7 +86,7 @@ export async function extractLastFrame(inputPath: string, outputPath: string) {
   for (const args of attempts) {
     try {
       await runFfmpeg(args, 60000)
-      if (existsSync(outputPath)) return
+      if (existsSync(outputPath) && statSync(outputPath).size >= 64) return
     } catch {
       // Try the next seek strategy.
     }
@@ -102,8 +108,38 @@ export async function extractFirstFrame(inputPath: string, outputPath: string) {
     '-q:v', '4',
     outputPath
   ], 20000)
-  if (!existsSync(outputPath)) {
-    throw new Error('Could not extract the first frame')
+  assertFrameFile(outputPath, 'first frame')
+}
+
+export async function extractFrameAt(inputPath: string, outputPath: string, seconds: number) {
+  if (!existsSync(inputPath)) {
+    throw new Error('Source video is missing')
+  }
+  const seek = Math.max(0, seconds)
+  await runFfmpeg([
+    '-y',
+    '-ss', seek.toFixed(3),
+    '-i', inputPath,
+    '-frames:v', '1',
+    '-update', '1',
+    '-an',
+    '-q:v', '2',
+    outputPath
+  ], 60000)
+  assertFrameFile(outputPath, 'frame')
+}
+
+export async function extractFirstFrameFromBuffer(video: Buffer, tmpDir: string) {
+  if (!video.length) throw new Error('Could not extract the first frame')
+  const input = join(tmpDir, `seg_head_${Date.now()}.mp4`)
+  const output = join(tmpDir, `seg_first_${Date.now()}.jpg`)
+  writeFileSync(input, video)
+  try {
+    await extractFirstFrame(input, output)
+    return readFileSync(output)
+  } finally {
+    try { unlinkSync(input) } catch { /* ignore */ }
+    try { unlinkSync(output) } catch { /* ignore */ }
   }
 }