i don't have any actual programs for you.. but i can tell you this (with almost absolute certainty) any program you find to do it, is only going to be a trial (nearly all trials have some limitation... since it's not for video you're probably only goign to be able to convert a set ammount of time (it'll probably also be less than a minute) or you can only convert so many files before the trial is over..

you're gonna have to look on p2p or torrent sites mor ehtan likely, and find one with a crack... (search: mp3 conversion crack) and find files that say they have the program + crack (free serial number generator thing)

or if you have the money to spend... just go to downloads.com, search mp3 conversion, find one that suits your needs, and go from there... nearly every program (i only say nearly cuz i can't say if there is some bs file on there, but i have never ran across anything but what it exactly says it is, and reliable at that) are real, and isn't just a scam, or some crap like that...