[DanielG]

Use DVD Decrypter ( http://www.mrbass.org/dvdrip/ ) to demux the DVD into m2v and ac3/wav files and then import them both into Sony Vegas.

Use IFO mode (press I in DVD Decrypter) and then go to the 'stream processing' tab and click the 'demux' checkbox.

Also, set File Splitting to 'none' - (Tools --> Settings --> IFO Mode) and set 'File Splitting' to None