How to extract audio from a video as MP3 — ffmpeg

You need just the soundtrack of a video — a song, a lecture, a voice memo.

ffmpeg -i input.mp4 -vn -c:a libmp3lame -q:a 2 audio.mp3
# -vn = no video; -q:a 2 = high VBR quality (0 best … 9 worst)

FFmpeg Cheatsheet one-page card — 28 commands that actually work — The full one-page card — FFmpeg Cheatsheet. Get the complete cheatsheet on GitHub