its so simple and some steps
- u have to install mozilla Firefox..
- now install Grease Monkey Addon on Mozilla Firefox 4 install Click Here..
- after install it go to this Link
and Click on install it ..... - Open now http://www.youtube.com/watch?v=cEDKBD8T2Gw
- or any your video u see link to download in diffirent formats .. also in mp3
- No need to use Any convertors Direct download of your desire..