This is tested under Ubuntu Linux:
<br>
<br>ffmpeg -i moviet.flv -f mp3 sound.mp3
<br>
<br>If you dont have ffmpeg, type "apt-get install ffmpeg" first.
<br>
<br>For example, to extract the sound of a YouTube movie:
<br>
<br>1) Delete your Browser-Cache
<br>2) Watch the Movie
<br>3) Go to your Cache folder
<br>4) The big file in there ist the movie
<br>5) Convert it to mp3 as described above