[mythtv-users] Need a second opinion regarding choppy video playback suspicions

[Kevin Ross]

  On 08/29/2010 07:02 PM, Craig Huff wrote:
> I have a newly built (second) remote frontend which has choppy video
> playback.  It is outputting SD to a standard NTSC-M TV display via
> S-video, using an add-on NVIDIA GeForce 8400 GS PCI video card.
> (FWIW, CPU is Athlon II x2 245 2900MHz.)
>
> Thought I'd found the solution to be adding "UseEvents" set to
> true/yes/on/1 in the Device or Screen section of xorg.conf, but found
> that was already there.
>
> Reading in the MythTV wiki at
> http://www.mythtv.org/wiki/NVidiaProprietaryDriver#Choppy_video.2FHigh_CPU_Usage,
> I see that newer NVIDIA devices (8200 mentioned) have this problem
> even with UseEvents declared.
>
> I have not run nvidia-settings on this FE yet, so it is possible that
> the other change recommended, setting Sync to VBlank in
> nvidia-settings might help.
>
> My suspicion, based on the cited web page is that this won't do me any
> good.  Can anyone confirm/deny or provide other suggestions?  My next
> "fix" will be to see if I have a suitable older NVIDIA card I can
> slide into this system to see if that will resolve the problem,
> however, since it is a low-profile case, that may prove to be a
> challenge ;-).
>
> TIA,
>
> Craig.

I get choppy video playback if I don't disable composite extensions in 
my xorg.conf.  Instructions are at: http://www.mythtv.org/wiki/VDPAU