[mythtv] new nVidia drivers and XvMC
John Patrick Poet
john at BlueSkyTours.com
Sat Jul 10 18:26:32 EDT 2004
John Patrick Poet wrote:
> Daniel Thor Kristjansson wrote:
>
>> I don't get HDTV at the moment. But I'd love it if someone could test
>> the 1.0-6106 driver with 1080i content I'd appreciate it.
>>
>> In particular there is a new option...
>> Option "XvmcUsesTextures" "boolean"
>> If enabled the driver uses the 3D engine for compositing instead of
>> video overlays. This may be a solution for our OSD problems...
>>
>> -- Daniel
>>
>>
>> ------------------------------------------------------------------------
>>
>>
>>
> I will compile up a version with XvMC enabled, and try it. Give me an
> hour.
>
> John
With XvMC *disabled*, setting XvmcUsesTextures makes no difference -- as
expected.
With XvMC *enabled*, setting XvmcUsesTextures makes thinks worse -- for me.
Turning on XvMC and XvmcUsesTextures off looks okay, but studders just a
bit more when any OSD is fading away -- compaired to having XvMC disabled.
With XvMC and XvmcUsesTextures enabled, the reaction to OSD is about the
same. The problem is, normal video has a constant studder to it. The
studder is very consistant, and very fast. Like a 30th/sec pause, jump,
30th/sec pause, jump, etc, etc, etc. I suppose that it is very
consitant may be a good sign -- you might be able to tune it somehow to
fix the problem.
I still get the smoothest playback with XvMC disabled on my 3GHz HT P4.
Doug's work with OpenGL has helped, as has his suggestions about nice
levels for X and mythfrontend. Studders are now very rare. Any
studders I get now, are much fewer and much shorter. It takes a slow,
close-up pan (say up a mountain) to invoke any kind of skip -- and those
are not reproduceable. Makes me think some further tuning of the Linux
scheduler could help.
John
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