what software should I use to extract mp3 from avi video ? (in batch mode)

hi ! I really need a fast program to extract mp3 audio tracks from avi files. I also need to do it in batch, that's why I can't use nandub (it will only extract audio from one file at a time). I tried several crappy sotware which pretend to extract mp3 from avi files, but they re-encode them ! (riverpast audio for example) I need the ORIGINAL mp3 file from the avi. Please help ! Thanks

You can try to batch + script VirtualDub. Code:

Searching for demux in titles: Maybe you can edit the title of this thread to contain demux.