just ANAL + gif

[transcode] Command '['ffmpeg', '-y', '-ss', '2', '-i', '/tmp/hls-worker-17b64c71/src.mp4', '-frames:v', '1', '-update', '1', '-q:v', '3', '/tmp/hls-worker-17b64c71/out/poster.jpg']' returned non-zero exit status 234.