[mythtv] Need help diagnosing slow XvMC problem

[Jerry Rubinow]

On 1/14/06, Michael Freeman <mlfreeman at gmail.com> wrote:
> what nvidia drivers work with XvMC and SVN from within the past three weeks?

I don't know, but I'm using 7667, and I tried a bunch of the later ones too.

> On 1/14/06, Jerry Rubinow <jerrymr at gmail.com > wrote:
> >
> > > -----Original Message-----
> > > From: mythtv-dev-bounces at mythtv.org
> [mailto:mythtv-dev-bounces at mythtv.org]
> > > On Behalf Of Jerry Rubinow
> > > Sent: Tuesday, January 10, 2006 5:10 PM
> > > To: mythtv-dev at mythtv.org
> > > Subject: [mythtv] Need help diagnosing slow XvMC problem
> > >
> > > When I play back content using XvMC, it plays back slower than real
> > > time, both HD and SD, cpu is not maxed out.  I haven't been able to
> > > figure out why, but it seems like it might be a Myth problem (but
> > > maybe not?).
> > >
> > > Here's what I have:
> > >
> > > Separate front end/back end.  Front end is a 2.8Ghz P4 with a GeForce
> 5200
> > > PCI.
> > > Running FC4 setup per Jarod's guide.
> > > Myth SVN as of about a week ago.
> > > Nvidia driver version 7667.
> > >
> > > Here's what I've tried:
> > >
> > > Tried with and without OpenGL sync.
> > > Tried Various Nvidia drivers up the the current 81xx.
> > > Tried playing same video files over nfs using mplayer with xvmc and
> > > they have no problem, so that seems to eliminate disk, network, or
> > > graphics card bandwidth problems.
> > > No deinterlacing going on.
> > >
> > > When it plays inside myth, everything is slow-mo.  Not a stuttering
> > > problem.  CPU usage is down below 20%.  If I turn off XvMC, SD plays
> > > back fine, but HD maxes out the CPU.  However, I hadn't been
> > > optimizing for P4 (d'oh), so that can probably be improved somewhat.
> > > But if I could get the XvMC thing working that would be a much better
> > > solution, since I'd have room to spare for deinterlacing and whatnot.
> > >
> > > All suggestions welcome.  I'll post whatever logs would be most
> > > helpful to diagnose this, just let me know which ones.
> > >
> > > -Jerry
> >
> > On 1/14/06, Rob R < rob.r at plutohome.com> wrote:
> > > What does the console output/frontend log show while it's playing in
> slow
> > > mo?
> > >
> > > I get that exact behavior when "extra audio buffering" is disabled.   My
> log
> > > shows a ton of "prebuffering pauses".  With extra audio buffering
> enabled,
> > > it works correctly *most* of the time but I haven't been able to totally
> > > solve it.
> >
> > Good suggestion.  I tried that and the problem got somewhat better,
> > but the video is still a little slow and sound is choppy.  When I do
> > mplayer -vo xvmc -vc ffmpeg12mc on the same mpeg file, it play back
> > absolutely perfectly, video and sound.
> >
> > My current playback settings are
> > -no deinterlacing
> > -standard xvmc decoder
> > -enable opengl vsync for timing
> > -enable realtime priority threads
> > -extra audio buffering (problem is worse without this)
> >
> > Myth svn, version 0.19.20051208-1
> >
> > Enclosed is the frontend output from -v all,nodatabase.  Things that
> > look like they might be prolems to my untrained eye (but maybe they're
> > ok):
> >
> > -VideoOutputXv Error: Couldn't get the color key color
> > -lots and lots of "Broadcasting free space avail" messages
> > -nVideoVideoSync: VBlank ioctl did not work, unimplemented in driver?
> > -DRMVideoSync: Could not open device /dev/dri/card0, No such file or
> directory
> > -a bunch of NVP: Video is X.XXXXX frames ahead of audio, skipping A/V
> wait.
> > -a bunch of audio waiting for buffer to fill: have 2048 want 4096
> > -a bunch of NVP: prebuffering pause
> >
> > CPU is around 40%
> >
> > Any suggestions on what to concentrate on and what not to worry about?
> >
> > -Jerry
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> >
>
>
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