sorry i misspelled, it's dvd decrypter, anyway this is the how-to:
- menu, mode, select ifo mode.
- select the source.
- check input in right side window, you should see the main vob, which is the whole movie (the longer one) and some shorter ones whether the movie has specials, bts or hidden
tracks.
Select one of the shorters (you must guess) and select stream processing, so you can demux the video and audio streams.