[mythtv-users] Possible XvMC prebuffering issues solution?

[Michael Tiller]

Thanks for the info.  I'm outputing to a normal TV-out (composite).  I'm not
sure what modeline to specify for that?!? Isn't the refresh rate of the NTSC
signal fixed?  What does changing the modeling do in that case?!?

--
Mike

On 11/29/06, Alex Halovanic <halovanic at gmail.com> wrote:
>
> Just posting this, hoping it will help someone else :)
> I was having lots of problems with XvMC playback of HD streams from my
> HDHomerun, with prebuffering pauses causing skips in sound and
> messages that the video was 4 or 5 frames ahead of the audio ever few
> seconds.  After trying every possible combination of settings possible
> (and realizing that the problem also existed in Xine), I think I've
> finally found the real solution.  I had been using a modeline with a
> vertical refresh of 59.94 hz in an attempt to keep it as close to the
> framerate of the videos and official specs.  Increasing this to about
> 60.92 hz (That's a dotclock of 74.9 for my 720p modeline) has gotten
> rid of nearly all of the pauses.  There's still some prebuffering for
> a few seconds after the channel is tuned, and when the program
> changes, especially when one commercial changes to another, but then
> it will "settle down" for the program, even when skipping about in it.
> Sometimes there are a couple of messages that the video is now ahead
> of the audio, but these too go away within a few seconds.  Total cpu
> usage for my wimpy little machine: 50-60%!
> Note: I take no responsibility if you try this and the higher refresh
> rate causes your tv to burst into flames
>
> My set-up:
> 1.6 ghz Duron KM400, 512 mb RAM
> Geforce 5200 FX, vga thru component converter at 720p to cheap Walmart
> Sanyo CRT
> Nvidia binary driver 1.0-9625
> Modeline "720p" 74.9 1144 1320 1376 1650 696 722 728 750 +hsync +vsync
> (actually 1144x696, adjusted for overscan)
> Myth SVN 11828 compiled for athlon-xp
> audio output device-ALSA:default, deinterlace Bob2x, Use Realtime
> Priority Threads, Extra Audio Buffering, UseChromaKeyOSD,
> UseXvMCForHDOnly
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