Let me preface this by saying that I hope this is for
your own personal use, cause using a DVD as a source won't fly here (for a few reasons besides illegality).
Depends what kind of DVD you're trying to rip. If it's a DVD-A disc, the copy protection for that format has not been cracked, and there is no way to extract anything from the AUDIO_TS folder. Some DVD-A discs have a VIDEO_TS folder readable by any DVD player (and rippable in the same way as a video DVD), but the audio in that one is usually just Dolby Digital, and therefore not nearly as good.
If you want to extract the soundtrack from a DVD-Video disc, you can use DVD Decrypter to rip the DVD, use DGMPGDec to demux the LPCM or AC3 (Dolby Digital) audio tracks, and then use BeSweet to decode/downmix/resample the desired track. You can also use BeSweet to transcode (ugh, yeah, but what can you do?) to WAV, MP3 (using the LAME encoder), Ogg Vorbis, or AAC.
You can find all this software (and excellent usage guides) at
Doom9.net. Best place on the net for technical DVD-related info.
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