[mythtv-users] mythbuntu and nvidia 7300 problems

[Misty P]

Steve Peters - Priority Electronics wrote:
> Hello, is anyone out there using an nvidia 7300 (pci express) with
> mythbuntu
> 7.10 or 8.04?

I *was* for a while using my 7300.  (I eventually abandoned it and upgraded 
to a 6200 that I also happened to have lying around.)

> I can't get playback to work smoothly unless i use the kernel
> decoder, and the motion is horrible with kernel.

I think you mean deinterlacer.  Have you tried Bob?

> I have a core 2 duo 1.8ghz with 1gb of ram in my mythbox. The playback
> worked great in ubuntu 7.10 with the yadif 2x decoder, but since i
> upgraded to mythbuntu in an effort to simplify things (because so
> many other things just weren't working right on plain ubuntu), i have
> most everything working great now, mainly except for the single most
> important thing: playback.
>
> When i attempt to use any other decoder, the playback will play for
> one second, then stutter for one second, play for one second, then
> stutter. Sound remains fine during playback, just the video keeps
> stuttering throughout playback.
>
> I have tried this with nothing else running on the system. When i use
> yadif 2x, the cpu jumps to 40% (20% of each core). With kernel, it is
> exactly half of that. Still, nowhere near full cpu usage. I told
> mythbuntu to use the newer nvidia drivers during install.

I, too, had bad results with yadif.  (same CPU, same amount of idle, same 
symptoms.)  I was able to get Bob to run just fine, however.

Some things I remember...  are you using openGL or qt?  OpenGL was a train 
wreck on the 7300, start to finish in the "DOES NOT WORK" category.  Are you 
using Xv, XvMC, or ????  I was able to get Xv to work just fine.  And, 
again, for a deinterlacer I was able to get Bob to do his thing.




I eventually abandoned my 7300 and upgraded to a 6200 because I could find 
no combination of GPU clock frequencies that wouldn't cause random crashes 
on my 7300 when using XvMC.  The 6200 works solid as a rock using XvMC, 
though that doesn't help you.

(I threw the 7300 in my windows box, and surprise surprise, solid as a rock 
there decoding video.  nvidia's linux support kind of REALLY sucks.  They 
don't care if their linux drivers work or not.)