Conversion from mjpeg to mp4 (libx264) with FFmpeg

Question

If you convert from mjpeg to mp4 (libx264) with FFmpeg, Playback can not be performed on Windows · Mac.

Thumbnails are not displayed on the icon. However, with the HTML5 Video tag, playback is possible.

Why? Please tell me if you understand. Thank you.

ffmpeg -i source_file.mov -b 4000k -vcodec libx264 destination_file.mp4

you might want to specify a specific transcode for the audio as well (eg `-c:a aac`), and make sure your ffmpeg is a current version — Offbeatmammal, Sep 19 '18 at 03:39

score 6 · Answer 1 · answered Sep 19 '18 at 05:03

6

The usual reason for this is the pixel format. The MJPEG may have 4:2:2 or 4:4:4 chroma sampling which most players don't support in H264. So try

ffmpeg -i source_file.mov -pix_fmt yuv420p -b:v 4000k -c:v libx264 destination_file.mp4

answered Sep 19 '18 at 05:03

Gyan

1 Answers1