[mythtv-users] Mythtv playback problem with NVIDIA videoa cceleration - HELP! (still unsolved)

Jarod Wilson jarod at wilsonet.com
Sat Apr 2 08:40:40 UTC 2005


On Friday 01 April 2005 14:52, Jarod Wilson wrote:
> On Friday 01 April 2005 07:35, Brian Stults wrote:
> > Jarod Wilson wrote:
> > > On Tuesday 29 March 2005 09:52, Jarod Wilson wrote:
> > >>>Can't wait to bench my new workstation -- Athlon 64 3500, PCI-Exp.
> > >>>GeForce 6600GT. :-)
> > >>
> > >>For the record, just did bench it. Kinda snappy:
> > >>
> > >>31203 frames in 5.0 seconds = 6240.600 FPS
> > >>31111 frames in 5.0 seconds = 6222.200 FPS
> > >>30740 frames in 5.0 seconds = 6148.000 FPS
> > >>31442 frames in 5.0 seconds = 6288.400 FPS
> > >>
> > >>That's w/the 7167 drivers on RHEL4 x86_64.
> > >
> > > And now with 7174, same box:
> > >
> > > 35696 frames in 5.0 seconds = 7139.200 FPS
> > > 35680 frames in 5.0 seconds = 7136.000 FPS
> > >
> > > Hopefully, 7174 has rectified all the issues that made 7167 somewhat
> > > still-born for so many folks...
> >
> > I've never used glxgears before, so I decided to give it a whirl on my
> > frontend.  I get *much* smaller numbers:
> >
> > 3057 frames in 5.0 seconds = 611.400 FPS
> > 3172 frames in 5.0 seconds = 634.400 FPS
> > 3162 frames in 5.0 seconds = 632.400 FPS
> > 3173 frames in 5.0 seconds = 634.600 FPS
> >
> > Of course, my system is very different from yours, so I'm curious which
> > particular difference between the systems makes the most difference in
> > the rendering speed.
> >
> > I suspect the two most relevant factors are CPU and GPU.  First, I only
> > have an Athlon XP 2400. Second, my mobo is a 7NIF2, so I'm using the
> > integrated MX 440.  Do both of these have a big influence, or would you
> > say one is more important than the other?
>
> I believe the video card should have a bigger impact. I have yet to test my
> 7NIF2 box, I'll play with that over the weekend though. I'm still not
> certain exactly what to expect where. My 2.8GHz HT-P4 workstation w/a GF FX
> 5200 only clocks around 1100fps. But then another system with a GF4Ti
> cranks out over 4000fps. The P4 has no problem keeping up with HDTV though.

Just benched my 7NIF2 box. Athlon XP 1800 cpu and I'm currently using an AGP 
card (gives better performance w/HDTV playback), clocks in around 1100fps 
w/the 7174 driver, was around 900fps w/6629. I'm guessing I'd be right in 
your ballpark using onboard video, since shared mem is slower.

Of course, OpenGL performance isn't directly relational to a system's ability 
to play back video anyhow, but not a bad way to see if the card is being fed 
as fast as possible. I seem to recall Brandon Beattie's site mentioning a 
high-end nVidia card and a GF4MX having roughly the same video decode 
ability, their only difference really being in the 3D arena. Whether that's 
completely accurate anymore when a GF4MX is compared with the GF 6 series' 
decode performance, I have yet to find out, but should this weekend...

-- 
Jarod Wilson
jarod at wilsonet.com

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