[mythtv-users] Oddly VDPAU makes things WORSE

Michael T. Dean mtdean at thirdcontact.com
Thu Dec 10 17:03:42 UTC 2009

On 12/10/2009 03:22 AM, Andrew Stevens wrote:
> On Wed, 2009-12-09 at 20:47 -0500, Ken Johnson wrote:
>> ...  I knew the issue was bigger then I thought so I ended
>> up scrolling through my playback profiles one by one trying to find
>> where the issue was and sure enough it was VDPAU when it was enabled
>> certain movies would tear BUT when I set my decoder to Standard with
>> xv-blit and softblend osd with Yadif deinterlacers IT WAS PERFECT. Sure
>> my cpu is now at 66% on average but its nothing the Quad can't handle.
>> Just wondering if this is a bug or my bad configuration.
> I've discovered the same phenomenon trying to track down some sporadic
> frame stutter (every few seconds) in 720p playback.
> (AMD64/X2 6000, GeForce9500GT).
> Endless fiddling with playback settings reveal VDPAU was actually MUCH
> worse than than simply using the Standard decoder and Xv blitting.
> Presumably some kind of sublte oops in the way mythfrontend tries to
> sync and/or a plain old display driver Bug from Nvidia.
> Extensive testing reveal trying various SyncToVBlank settings could make
> things *worse* but not better.   Next in line for experiments is
> Compositing...

Note, also, that if your processor is one where the memory bandwidth 
drops when processor frequency scaling drops the CPU frequency, it can 
make VDPAU not work.  This would include the AMD line of processors...

Set your system to run in performance mode and see how it looks.


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