If you want to extract the audio tracks from DVDs, then you need a, DVD ripper. Some good DVD rippers for Linux are K9copy, K3b, dvd::rip, and VLC Media Player. HandBrake and DVDFab are good Windows rippers, and VLC also runs on Windows. Try VLC first; it is open source, is free of cost, and has the most features. With VLC, you can extract and transcode your DVD audio tracks into almost any format. Again, you’ll get best quality by ripping to the native format and then can use Audacity to export to other formats if you need to do so.