let me guess, the picture is full of garbage, even if you get a picture?
The main problem with stock dvd:s is that they are encrypted. And yeah, the decrypting isnt a cheap license of something like that, so there isnt one included in any of the aps. There is a lib that has been made to get around this, and it works great. The one thing is, that in most countries it is illegal.
I dont know hwre you live, so I wont lecture you anymore on that matter, check it out if you want and are alowed to. Heres a grab from its slackware package description:
libdvdcss: libdvdcss (dvd viewing library)
libdvdcss: libdvdcss allows you to view DVDs you have legally
libdvdcss: purchased on your computer. It's purpose is to
libdvdcss: decrypt the scrambled signal Hollywood requires
libdvdcss: DVDs be shipped with, and allows that stream to
libdvdcss: play back on your computer.