[mythtv-users] Fwd: Sempron 3100 lag when viewing HD from 6200 STB

Matt Mossholder matt at mossholder.com
Tue Jan 10 05:34:19 UTC 2006


On Mon, 2006-01-09 at 22:22 -0700, Curtis Stanford wrote:
> On Jan 9, 2006, at 5:04 PM, Steve Adeff wrote:
> 
> > On Monday 09 January 2006 17:31, Curtis Stanford wrote:
> >> On Jan 9, 2006, at 3:21 PM, Steve Adeff wrote:
> >>> On Monday 09 January 2006 16:58, Curtis Stanford wrote:
> >>>> On Jan 9, 2006, at 2:49 PM, Steve Adeff wrote:
> >>>>> On Monday 09 January 2006 16:35, Kevin Kuphal wrote:
> >>>>>> Adam Propeck wrote:
> >>>>>>> Here is some more detail. ( Xrog.conf and some hdparm info) I'm
> >>>>>>> wondering if livetv isn't playing well because of the specific
> >>>>>>> firewire port/driver? I'm using the single port that comes with
> >>>>>>> the
> >>>>>>> audigy 2 PCI card I'm using. Also, I guess I was wondering if I
> >>>>>>> need
> >>>>>>> to do anything specific with the fact that I'm using an Nforce 3
> >>>>>>> motherboard. Any tweaks that are recommended? Thanks, -Adam
> >>>>>>
> >>>>>> I think the problem is that fundamentally, the ATI driver does  
> >>>>>> not
> >>>>>> provide hardware accelerated MPEG-2 playback and your Sempron
> >>>>>> cannot
> >>>>>> handle the software decoding without choking.  If you had an
> >>>>>> Nvidia card
> >>>>>> that supported XvMC you could enable that which would activate  
> >>>>>> the
> >>>>>> hardware decoding and probably give you the performance you  
> >>>>>> expect.
> >>>>>>
> >>>>>> Kevin
> >>>>>
> >>>>> I'm going to have to agree, unless someone else is running a
> >>>>> Sempron 3100 and
> >>>>> able to do live HDTV I'm going to have to think this is the  
> >>>>> case. I
> >>>>> know my
> >>>>> Athlon64 3200+ has no room to spare playing live HD, I can easily
> >>>>> imagine a
> >>>>> Sempron of lower clock speed having more trouble.
> >>>>> LiveTV requires a bit more resources from mythbackend and
> >>>>> mythfrontend from
> >>>>> what I've noticed.
> >>>>>
> >>>>> --
> >>>>> Steve
> >>>>
> >>>> That seems like a lot of power! I'm decoding HD (live and recorded)
> >>>> on an old 2.4G Pentium4. Using the nvidia driver without XVMC I'm
> >>>> seeing about 50% CPU usage. An Athlon64 3200+ should kick my  
> >>>> butt. Or
> >>>> is it an ATI problem??
> >>>>
> >>>> Curtis

I've got a Sempron 64 3100+, running Nvidia driver rev 7667, with 1080i
output over DVI, and have only some very slight tearing, which is
consistently about 20% down from the top. Load is reasonable.

	--Matt



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