[mythtv-users] Fwd: Problem with XvMC being slow

Adam Propeck adam at propeck.com
Tue Jan 17 06:12:12 UTC 2006


Are you using an Nvidia card? I've got a Sempton 3100, and I know that I
couldn't for the life of me, play 1080i or 720p with the Sempron and an ATI
card.

On 1/17/06, Chad <masterclc at gmail.com> wrote:
>
> On 1/16/06, Adam Propeck <adam at propeck.com> wrote:
> > Steve... I'm assuming that you mean you can play HDTV with one of those
> > processors and an Nvidia card correct? :-P I still couldn't get my ATI
> to
> > play HD worth a hoot, and went out and purchased a cheap Nvidia 6200OC
> > tonight. I've gotten HD to play back fairly smoothly now, but have a bit
> of
> > playing to get done.
> >
> > On 1/6/06, Steve Adeff <adeffs at gmail.com> wrote:
> > > On Friday 06 January 2006 00:05, Jerry Rubinow wrote:
> > > > On 1/5/06, Jerry Rubinow <jerrymr at gmail.com> wrote:
> > > > > On 1/5/06, Joseph A. Caputo < jcaputo1 at comcast.net> wrote:
> > > > > > On Thursday 05 January 2006 1:21, Jerry Rubinow wrote:
> > > > > > > When using XvMC to play back video, CPU usage is low (30% for
> HD,
> > 10%
> > > > > > > for SD), but the video plays back slower than realtime.  I'm
> using
> > an
> > > > > > > Nvidia 5200 card, with driver version 7667 (although I've
> tried
> > every
> > > > > > > version up to the current 8XXX).
> > > > > > >
> > > > > > >  Is there anything I should check?  Anything obviously wrong
> from
> > the
> > > > > > > following details?  Or is this the XvMC slowdown I've read
> about?
> > > > > > > What are my options for fixing this?
> > > > > >
> > > > > > I could be way off base on this, but something in my memory is
> > nagging
> > > > > > me... something about maybe Nvidia's XvMC not
> supporting/performing
> > > > > > well at certain resolutions?  Have you tried changing your
> > horizontal
> > > > > > resolution to something smaller, like 1024?
> > > > >
> > > > > No, but that's a good suggestion - I'll try it tonight.  Thanks.
> > > >
> > > > No luck.  I tried setting both X and the GUI setup in myth to
> 800x600
> > > > and it's still slow playing HD.  Not stuttering, just slower than
> real
> > > > time.  I didn't mention before, but I'm using pretty much a straight
> > > > following of Jarod's guide with FC4, 2.6.14, on a P4 2.8.
> > > >
> > > > I'm so close to having beautiful HD playback, can anybody suggest
> things
> > to
> > > > try?
> > >
> > > poney up for a faster processor? I know its prbly not an optioin, but
> with
> > a
> > > 3.0 or 3.2GHz cpu you'll be able to play back HD without XvMC.
> > > Does OpenGL sync work with XvMC? I dunno, but might be worth a try.
> Also,
> > try
> > > disabling any deinterlacing? Oh, what about audio buffering options,
> have
> > you
> > > played with those?
> > > Also, don't forget you have to restart mythfrontend everytime you make
> one
> > of
> > > these changes. minor bug...
> > >
> > > --
> > > Steve
> > > _______________________________________________
>
> Hopefully getting the Nvidia will do it.
>
> I've got a modest Athlon XP 2500 powering my rig, but the XvMC offset
> from my FX 5200 takes the load down to ~45% when playing back a 1080i
> stream (720p is somewhere is the 50% range, though I don't know if
> that's just what top decided to throw up and there is no difference).
> So I would assume a decent P4 (2.4ish) should work just fine.
> Something less should work well too, but a 2.4 would give you enough
> overhead for realtime comm flagging as well.
>
> Not sure why the above poster had to increase the ring-buffer size,
> this has never been something I've had to tamper with to get my HD
> working well, but I'm glad no less :)
>
> Chad
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>
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