问题
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
回答1:
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
来源：https://stackoverflow.com/questions/52396602/conversion-from-mjpeg-to-mp4-libx264-with-ffmpeg