It turns out removing the audio from a video is very easy with FFMPEG!
To remove the audio from a video:
ffmpeg -i video.mp4 -c:v copy -an out.mp4
The -an option will completely remove the audio from a video, and since we're just copying the video codec as is, this most likely will only takes seconds.
To extract the audio from a video:
ffmpeg -i video.mp4 -vn audio.wav
As you might have guessed, the -vn option will remove the video stream from the output, leaving only the audio. In this case, I'm re-encoding the audio as WAV, as that is a very good encoding to work with in terms of further processing.
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