I am trying to convert a .mov video to .mp4 with ffmpeg:

ffmpeg -i ~/Desktop/Sample.mov ~/Desktop/Sample.mp4

This doesn't work though, and when I try to open the produced video in quicktime it tells me that the file is either corrupted or in a format quicktime doesn't understand.

How do I get this to work?

  • Use handbrake for MAC – answerSeeker Dec 10 '16 at 19:10

To convert videos, I like to use handbrake. You can find it here: https://handbrake.fr/ I use it on Linux but it should work well on MAC too.

For HandBrake:

handbrakecli -i {in-video}.mov -e x264 -E facc -o {out-video}.mp4

For ffmpeg:

ffmpeg -i {in-video}.mov -vcodec h264 -acodec aac {out-video}.mp4
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  • Handbrake worked. The ffmpeg command doesn't. – theonlygusti Dec 12 '16 at 22:34
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    ffmpeg worked great as above for me – Andy Mar 24 '17 at 22:16
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    Works great! Thanks! What does the -strict 2 stand for? I couldn't find it in the commands list nor in the full documentation. When trying to run with and without it - couldn't find any difference. – arieljannai Nov 29 '17 at 19:22
  • @arieljannai, I just saw your comment. If you look at the documentations on the ffmpg website, linux.die.net/man/1/ffmpeg you will see that it says: -strict strictness How strictly to follow the standards. – answerSeeker May 4 '18 at 18:41
  • Maybe I found another documentation 😳 thanks! – arieljannai May 5 '18 at 11:05


You can stream copy if the MOV file contains video and audio that is compatible with MP4:

ffmpeg -i input.mov -c copy output.mp4
  • Stream copy (-c copy) is like a "copy and paste" so the quality is preserved and the process is fast.

  • Video formats compatible with MP4 include: H.264, H.265/HEVC, AV1 (new format, so not universally supported), MPEG-4 (old format, not supported in HTML5).

  • Audio formats compatible with MP4 include: AAC, MP3 (playback support depends on player), Opus (new format, so not universally supported).


This will convert the MOV to H.264 video and AAC audio:

ffmpeg -i input.mov -c:v libx264 -c:a aac -vf format=yuv420p -movflags +faststart output.mp4
  • -c:v libx264 choose encoder libx264 to output H.264 video.
  • -c:a aac choose encoder aac to output AAC audio.
  • -vf format=yuv420p chooses YUV 4:2:0 pixel format. libx264 supports many pixel formats and by default will choose a pixel format that most resembles the input. But not all pixel formats are supported by all players. yuv420p is the most compatible and universally supported.
  • -movflags +faststart same as the Web Optimized option in Handbrake. After encoding completes it moves a chunk of info from the end of file to the beginning so it can start playing faster when viewing via download.

See FFmpeg Wiki: H.264 and FFmpeg Wiki: AAC for more info.

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