Abstract audio from almost all kind of video:  AVI, MPEG, Flash, WMV, MOV, .DVD VOB, MP4, 3GP etc.

Bluefox Video Converter supports converting iPod mp4 video,wmv/mpeg/avi to mp4,mp4 to mp3,wmv to mpeg/mov/avi and convert flv to avi, 3gp to mpeg and so on.