Just a short note on this right now:
Audio can be extracted with mplayer using -dumpaudio option (low quality), ffmpeg tool with -ab and -ar options or online for youtube videos at vixy.net.
Quick video converter flv2mpg using ffmpeg is shown at Linux by Example, too.
Update: Another great open source program is MediaCoder which even has a special audio edition.
Ressources
- Linux by Example audio
- Linux by Example video
- online extraction at vixy.net








