[mythtv-users] Audio problem with HD using XvMC

Siva Alagarsamy hellosiva at gmail.com
Fri May 4 13:46:25 UTC 2007


Yes, I do have the extra audio buffering turned on.
Thanks,
Siva

On 5/4/07, Patrick Ouellette <pat at flying-gecko.net> wrote:
>
> On Thu, May 03, 2007 at 10:18:29PM -0400, Siva Alagarsamy wrote:
> >
> > Hi,
> > When I use XvMC with HD channels, the audio break up often and I see lot
> of
> > these messages like these.
> >
> >
> > 2007-05-03 15:31: 18.312 WriteAudio: buffer underrun
> > 2007-05-03 15:31:18.298 NVP: Video is 7.24978 frames behind audio (too
> > slow), skipping A/V wait.
> >
> >
> > I have AMD Athlon64 3000+ processor with 512MB RAM,  ATI HDTV Wonder,
> NVIDIA
> > FX 5200 video card & SB Live card
> > I have ubuntu feisty(i386) with the latest kernel and mythtv packages.
> >
> > Without XvMC, I have no problem with the video or audio. I trying to get
> > this XvMC working, so I can setup another computer for frontend with a
> less
> > CPU power.
> >
> > I have XVideoTextureSyncToVBlank & XVideoBlitterSyncToVBlank turned off
> in
> > nvidia settings.
> > The xorg.conf has "UseEvents" set to "true". I have tried different
> NVAGP
> > options.
> >
> > XvMC works fine with mplayer. I tried playing a HD recording with
> mplayer
> > -vo xvmc and it plays without any problem. If I watch the same recording
> > with MythTV, I get audio stutter problem with lot of "WriteAudio: buffer
> > underrun".
> >
>
> Have you enabled extra audio buffering?  That clears up the stuttering
> on my system when running XvMC.
>
> My system: AMD64 3000+, 512MB RAM, NVIDIA 6600, NFORCE 4 chipset using
> S/PDIF out (ALSA drivers), on Debian SID.
>
> Pat
>
> --
>
> Patrick Ouellette                 pat at flying-gecko.net
> kb8pym at arrl.net                   Amateur Radio: KB8PYM
> Living life to a Jimmy Buffett soundtrack
> "Crank the amp to 11, this needs more cowbell - and a llama wouldn't hurt
> either"
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