DVD videos won't play, although audio works?

since upgrading to 10.8.4, DVD videos, including rental movies, discussions from teaching sessions, and conversions from home movies won't play, although sound is audible. Video player is "App version 5500.38.2; Framework version 5.7.1. I have rarely used DVDs on the machinge, but did work fine in past. Any suggestions appreciated

What comes to mind is that the DVD player will only work with certain original Apple manufactured DVD drives.  (Licensing issue since Apple pays a license fee for the MPEG software on the DVD drive.)  Are you using the original built-in drive?  VLC doesn't care about the license but states that it is up to the user to insure proper licensing.  Look in About This Mac to see what information it has about the DVD drive.  Perhaps it is somehow sending the wrong information.
Can you view MPEG movies on the Apple site.  For example the movie trailers.

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