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

Adam Propeck adam at propeck.com
Tue Jan 10 01:55:12 UTC 2006


I find it frustrating that this is a Linux only issue. If I had trouble
playing an 1080i stream on a Windows box with a 3 ghz proc, I'd go crazy.
Why is it that Linux has so much trouble with this? I would think that it
would be an easy thing like enabling the correct video driver or something.
I thought maybe my AGP GART stuff could have been set incorrectly or
something.

On 1/9/06, Steve Adeff <adeffs at gmail.com> 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
> > >
> > > weird, I've got an nvidia card. I'm using top and showing that
> > > mythfrontend+Xorg ~70-98% cpu usage for live and recorded 1080i
> > > playback, it
> > > could be that my output is 1280x720 since nvidia can't do
> > > interlaced output
> > > over DVI. Its much lower for 720p playback. I bet thats it,
> > > resizing...
> > >
> > > --
> > > Steve
> >
> > Yes, my TV only does 720p.
>
> strange, I don't know. what version nvidia driver? what xorg version?
> maybe its that I'm running Debian64?
>
> any others with Athlon64 3x00+ care to chime in?
>
> --
> Steve
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