I've not heard of any conventional method.  If it were me, I would
look for either a product which provides this data while it plays a
DVD, or use an open source software based DVD stream reader and
player, such as VLC, MPlayer, or the like.

http://en.wikipedia.org/wiki/MPlayer
http://en.wikipedia.org/wiki/VLC_media_player

(Assuming the intended application can cope with the power cost).

--=20
James Cameron
http://quozl.linux.org.au/
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