[fritsch]

I can confirm that in build #0225, the black artifacts are gone now.  Woohoo!

Also, the update to pvr.mythtv adds new buffering functionality, which allows for smooth playback of 1080p mpeg2 Live TV.   

I can also confirm the black artefacts are gone. thanks guys!!   

I'm still having the artifacts. It's noticeably better with 'limited color range' turned on, but the artifacts are still there.
Here are some images and the log file. I hope you can find a fix. #0205 was the last version without artifacts. 

 Could you please post a sample?