I am seeing the exact same thing in Myth as the Dog.
As I said above, I compile SVN.mythtv-fixes.20445 with the glvdpau.20405
patch. As I am about to ditch Ubuntu for Debian, I'm not about to go to the trouble of compiling mplayer or xine, and I never actually use them anyway. And as Ubuntu's package system is busted I can't install them, much less with VDPAU support. Myth is my entertainment system.
I don't know what else to do. This clip and numerous others of the same source, are unwatchable with VDPAU in Myth. And driver 185 is driving me crazy because over a couple hours it climbs to 100% CPU usage for X. I can't do with this, as I have to work.