[mythtv-users] Audio Buffer Underruns with XvMC and HD in 0.20

Dylan Semler dylan.semler at gmail.com
Fri Sep 15 04:08:55 UTC 2006

On 9/14/06, Randall Blecher <randallb at gmail.com> wrote:
> With 0.19, using XvMC to watch HD, I would only get an occasional buffer
> underrun normally (except when the GUI was on the screen, during which the
> underruns were annoying).
> Now with 0.20, the buffer underruns are much worse.  I can't watch HD wth
> XvMC without a lot of scrolling "WriteAudio: buffer underrun" errors.
> Turning on the "extra audio buffering" setting in the Playback Settings
> greatly reduces the amount of errors, but still not enough to make watching
> possible. I'm wondering if adding even more audio buffering (if such a
> setting existed) would fix this.  My CPU is still only around 40% (just as
> it was with 0.19) when watching HD with XvMC.
> Anyone else have this problem?
> My setup:
> Athlon XP 3200+
> 512MB RAM
> GeForce FX 5500
> Nvidia 1.0.8774

Not too sure if this is still an issue, maybe verify that you're still
using ALSA rather than OSS.  I think a while ago this solved a lot of
problems for people.


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