[mythtv-users] XvMC - Nvidia isssues?

Dan Seddon Dan.Seddon at framestore-cfc.com
Sun Jan 22 21:54:40 UTC 2006


>
> I was having the EXACT same issues with my standard PVR-250. If I
> disabled the XvMC it would jump and stutter, but enabling it messed up
> the menus. I was running the nvidia version 8178 and downgrading to
> 7676 solved it all.

Hmm... The 7676 thing got me quite excited on the way home from work - but
having taken a look at my system, I am using 7676. So, close but no
banana.... Also, all the other things seem OK as well - OpenGl Vsync is
working fine (looking at the log) and TS is enabled (though my problem
"test .nuv" was recoreded when I didn't have this enabled - the problem
has continued since I last went anywhere near mythtv-setup).....

However - now I know how get at log, yes I'm pretty new to this... :/ I
can tell you that I get this whenever I'm playing problematic video:

2006-01-22 21:43:56.498 WriteAudio: buffer underrun
2006-01-22 21:43:56.562 A/V diverged by 4.55715 frames, extending frame to
keep audio in sync
2006-01-22 21:43:56.646 A/V diverged by 4.6491 frames, extending frame to
keep audio in sync
2006-01-22 21:43:56.727 A/V diverged by 4.44933 frames, extending frame to
keep audio in sync
2006-01-22 21:43:56.809 A/V diverged by 4.04322 frames, extending frame to
keep audio in sync
2006-01-22 21:43:56.891 A/V diverged by 3.47615 frames, extending frame to
keep audio in sync

Which takes me back to the difference in audio in this recording (256 vs
192) - though Justin did mention this might be a TS issue earlier, where
the TS version contained more than one audio channel. It's notable that I
get

2006-01-22 21:43:56.498 WriteAudio: buffer underrun

On *all* recordings/live tv - but only on some does it progress to the
stuttering and above. So maybe the jump from 192 to 256 is the straw that
breaks the camel's back - so to speak. What I don't understand is why I
would get this when I'm running XvMC, but not the rest of the time -
though I can't check what I get the rest of the time right now, as my
flatmates watching the telly.... Anyway - the above looks like a good
nugget to go searching with, so I'm going to do exactly that. But, thanks
for the help and if anyone can think of anything else that would be great!

Thanks

Dan



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