How can I extract audio from a YouTube video?
install Youtube-dl and FFmpeg then use the following commandline
Download the video
youtube-dl --extract-audio --audio-format mp3 http://www.youtube.com/watch?v=YOURVIDEO
optionally use the -k
flag to keep the video by default it deletes the video
I have had success with video2mp3.net – it is free and online!
Add the YouTube to MP3 firefox add-on.