Various Info
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http://members.aol.com/mpucoder/DVD/index.html
http://dvd.sourceforge.net/
Try this:
./gst-launch dvdnavsrc location=/dev/dvd ! mpegdemux video_%02d! { queue ! mpeg2dec ! sdlvideosink } mpegdemux0.private_stream_1_%02d! { queue ! a52dec ! osssink }
You can give title, chapter, and angle parameters to dvdnavsrc.