Okee i have the real solution for what you seek and besides i''m doing it always. But in many cases you have to be a bit creative. Use VirtualDub
, under file menu item you can find the option to rip the sound tracks of a video as wav but may be also as mp3 in the new releases. But anyway if you have wav you can convert it easily with the many available converters. If you are seeking a conversion soft i have the absolute best one, take a look at dBpower AMP and teel the rest if it''s not the best. It''s very very advanced and for sure no GUi toying tool.
Okee there are also other alternative, like the quicktime 6.5 pro where you can rip the sounds track too, and many other alternatives but what i gave you is the cheapest and for sure the best and you can try it for your self.