How do I extract audio from a video and turn it into an audio file?

I’m making an animatic, and want to know how to extract audio from a video and turn it into a file I can insert into a movie making program.

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With ffmpeg installed, you can extract just the audio. Here is a sample command usage:

ffmpeg -i video_file.mp4 audio_file.mp3

You may want to pass through the audio so it's not reencoded. The top answer on this stack overflow article has an example. https://stackoverflow.com/questions/9913032/how-can-i-extract-audio-from-video-with-ffmpeg

And a copy/paste:

ffmpeg -i input-video.avi -vn -acodec copy output-audio.aac

Certainly. ffprobe is also a good command to check what audio codec is in the video

For those not comfortable with a terminal, I suggest VLC. I'm 95% sure it is just using ffmpeg under the hood as well.

I’m trying to download it, but my Chromebook is making the file register as “read only.” How do I fix that?

I don't think ffmpeg works on Chromebooks.

This online converter worked for me.I don't know if there's a size limit; if there is you may have to trim the video first.

If you search "extract audio from video" online you can find other similar options.