Hi Mike, Thanks for your response. I did read that section of the mythtv HOWTO but it seems to create even more questions.
I think my confusion comes from having previous experience with the pvr 350. With the pvr 350, the encoder encoded the analog video to an mpeg2 file and the mpeg decoder hardware handled all the decoding and left my cpu mostly idle. In my current setup I have swapped the pvr 350 encoder for the hd5000 card which takes an existing mpeg2 stream and writes it to a file. Not much for the cpu to do there. I have also swapped the pvr 350 decoder for the nvidia card. If the card works as nvidia claims, it should handle all of the decoding. Again, there shouldn't be much for the cpu to do. It doesn't make sense then that using mpeg decoder in the graphics card should also require a 2 ghz pentium which is the equivalent of a super computer only a decade ago. So I have made some progress. As I described before, watching standard def was mostly smooth with minor stutters. Watching hd had major stutters and was unwatchable. I figured out that I didn't have the Xvmc switch turned on in mythtv. When I turned on that switch, things changed. With the Xvmc switch turned on in mythtv, both standard def and high def tv playback was smooth but both were playing back at half speed. I don't have any audio hooked up at the moment so I don't know how the audio sounded. I ran the "top" command and the cpu was running at 75% so it doesn't seem like it was truly maxed out. So has anyone experienced xvmc playing video at half speed? I checked my hard drive already to make sure it had dma enabled etc.
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