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Combine an audio and video track in ffmpeg

https://superuser.com/a/277667

ffmpeg -i $VIDEO_FILE -i $AUDIO_FILE -c:v copy -c:a aac output.mp4

Combine without re-encoding (if using container output)

ffmpeg -i $VIDEO_FILE -i $AUDIO_FILE -c copy output.mkv

Combine and replace existing audio in video file

ffmpeg -i $VIDEO_FILE -i $AUDIO_FILE -c:v copy -c:a aac -map 0:v:0 -map 1:a:0 output.mp4
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Dan Nemec
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