Get the audio out of a video

A talk, a lecture, an interview, a song someone sent as a video. The picture is a few hundred megabytes you do not need; the audio is a few.

The video track is genuinely discarded rather than carried along invisibly, which is the difference between a file you can put on a phone and one you can't.

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Worth knowing

MP3 to listen, WAV to edit
MP3 plays on everything and is about a tenth the size. WAV is uncompressed PCM, which is what an editor or a transcription tool wants to be handed — no second generation of lossy compression on top of whatever the video already did.
FLAC is not an upgrade
The audio inside a video file is already lossy. Extracting it to FLAC preserves it perfectly and improves it not at all — you get a much larger file holding the same sound. Choose it when something downstream demands FLAC, not for quality.
Long recordings are fine
There is no imposed length or size cap. The real limit is your machine: a browser tab has roughly 1.8 GB of working memory, and you are told before starting if a file will not fit rather than after twenty minutes.

The specific conversions