[mythtv-users] XvMC WriteAudio: buffer underrun -- partial solution

[Chris Skalenda]

On Sat, 2006-09-30 at 11:19 -0600, Dylan Semler wrote:
> Many have been complaining about the appearance of a new XvMC error
> after upgrading to 0.20:
> 
> 
> 2006-09-30 16:06:19.902 WriteAudio: buffer underrun
> 2006-09-30 16:06:19.995 NVP: prebuffering pause
> 2006-09-30 16:06:20.346 WriteAudio: buffer underrun
> 2006-09-30 16:06:20.614 WriteAudio: buffer underrun
> 2006-09-30 16:06:21.002 WriteAudio: buffer underrun
> 
> 
> While I'm not sure if I had these problems in 0.19, I've been able to
> get almost perfect XvMC playback by changing the NVAGP setting to "2"
> in my xorg.conf:
> 
> Section "Device"
>         Identifier  "Videocard0"
>         Driver      "nvidia"
>         ...
>         Option      "NVAGP" "2"
>         Option      "XvmcUsesTextures" "1"
> EndSection

Setting NVAGP to 2 in my xorg.conf cleared up the prebuffering pause
issues my mythtv system (Athlon XP 3000+, GeForce 6200, etc. Quite
capable of playing HD) was having with 1080i playback with 0.20. 

CPU usage dropped from 90-100% (with or without Bob on) to 30-40%. It
doesn't even stutter when the OSD comes up.

You're a lifesaver! :) 
-- 
Chris Skalenda <chris at atld.org>