[mythtv] Re: Another data point for the new XvMC stuff

[Mark Frey]

On Mon, 02 May 2005 19:27:28 -0700, "Mark Frey" <markfrey at fastmail.fm>
said:
> > 
> > On Sat, 2005-04-30 at 11:37 -0700, Mark Frey wrote:
> > > This also works poorly for me. I get many glitches and pauses, even on SD
> > > material. Unaccelerated playback is fine.
> > > I'm using an Nvidia fx5200 with the patched 7169 drivers.
> > Your card should be fast enough, unless the fan is broken and it's
> > running at partial speed. My GX5200 runs glxgears at around 2000 fps,
> > you should be getting something similar.
> > 
> > > > 2005-04-30 09:14:02.486 Couldn't get the color key color, and we need it.
> > > You likely won't get any video.
> > > 
> > > Could this be causing my problems? How do I fix this?
> > If you see any video it isn't causing your problem. You probably want to
> > try
> > a working video driver however. I'm using nvidia's 66.29 drivers.
> > 
> > > Playback log:
> > > 2005-04-30 09:14:02.444 XvMCSurfaceTypes::find(w 1280, h 1, chroma 1, vld 0,
> > > idct 1, mpeg2, sub-width 0, sub-height 0, disp, p<= 177, 1770 <=p, port,
> > > surfNum)
> > This shouldn't cause a problem, but you may wish to update to CVS.
> > 
> > > 2005-04-30 09:14:03.511 A/V diverged by -4.12468 frames, dropping frame to
> > > keep audio in sync
> > Have you tried using "Extra Audio Buffering"?
> > 
> > > 2005-04-30 09:14:03.943 AddInheritence past      F   NOT in used or in done.
> > > AALLAAAU
> > This indicates that your computer can not keep up with filling the
> > XvMC buffers. This is unusual, are you sure mtrr and AGP are working? 
> > When you run dmesg are there a lot of complaints from the kernel?
> > 
> > -- Daniel
> > 
> 
>  Well I found my problem, your asking about glxgears led me to it.
>  glxgears was pegged at 60 because I had sync to vblank on (both for
>  opengl and xvideo). I turned this off to check my glxgears score and
>  voila, XvMC works fine for me now. It is odd because the old XvMC stuff
>  didn't seem to suffer from sync to vblank being on, nor does the Xv
>  stuff. Anyhow, I'm happy now, thanks for your help. Maybe this also
>  will help some of the others having issues.
> 
> -Mark
> -- 

Okay, looks like things aren't quite ideal for me yet. With the sync to
vblank off I get unpleasant tearing on playback. Should having sync to
vblank on be causing problems with XvMC?

In answer to Daniel's questions:
My fx5200 is fanless and running fine (glxgears == 3000, AGP is on, mtrr
is compiled into the kernel: is there anything special I should do with
mtrr?)
Extra Audio Buffering is on.
dmesg output is fine, no complaints there.
I guess I can roll back to 6629, but 7167 actually seem to work well for
me. I will try tomorrow and see if it makes a difference.

Without XvMC I can play back 720p programs with about 75% processor
usage, but I need XvMC to play back 1080i completely smoothly.

-Mark


-- 
  Mark Frey
  markfrey at fastmail.fm