[mythtv] XvMC studdering

Jerry Rubinow jerrymr at gmail.com
Mon Jan 16 04:16:31 UTC 2006

On 1/15/06, Matt <skd5aner at gmail.com> wrote:
> On 1/15/06, Kevin Kuphal <kuphal at dls.net> wrote:
> > Kevin Kuphal wrote:
> > > I'm working on testing some XvMC support for my GeForce MX 440 card in
> > > anticipation of trying HD recording and playback and I've built my
> > > master backend frontend with XvMC and OpenGL Vsync now and I'm trying to
> > > playback some MPEG-2 content which normally plays back just fine on this
> > > system without XvMC but I'm getting very studdery playback.
> > >
> > Just an update.  I updated to the latest SVN and the segfault is gone
> > and I get solid XvMC playback with or without OpenGL Vsync.  Thanks for
> > bearing with me.  I wonder if I was hitting that XvMC segfault that
> > Daniel fixed.  Either way it works.  Now I need to wrestle with whether
> > or not to pick up an Avermedia HDTV tuner to pull the QAM stations off
> > my cable provider.  So tempting with the "big football game coming" :)
> >
> > Kevin
> Kevin,
>    Thanks for posting this info.  I've never been able to get XvMC to
> play without studdering, and that's with NTSC standard def.  I haven't
> tried it in a long time, but when I get a chance, I'll try again with
> latest SVN and let you know how it works for me.
> Thanks!
> Matt


Today I finally got XvMC playback working, after trying lots of
different settings, drivers, etc.  What finally got rid of stuttering
and slow playback for me was increasing the ringbuffer size.  My
symptoms in the log were lots of "prebuffer pause" and "video ahead of
audio" messages (so probably not the same thing as Kevin's problem).

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