masterclc at gmail
Nov 22, 2006, 11:41 PM
Post #2 of 3
(654 views)
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On 11/22/06, Kurt Yoder <ktymyth [at] yoderhome> wrote:
> Hi all
>
> So I got my pchdtv 5500 working, but playing output from it seems to
> blow away my myth machine. It hovers at 80-95% cpu usage, and a uses
> a significant chunk of memory. Frequently it crashes the whole myth
> front-end. Output is choppy with lots of missed frames and stuttering
> sound. Am I doing this right? What should I do to fix this?
>
> Hardware:
>
> I forgot CPU exactly, but dmesg reports "CPU0: AMD Athlon(tm) 64
> Processor 3000+ stepping 02"
>
> video card: nVidia Corporation NV44 [GeForce 6200 TurboCache(TM)]
>
> memory 1 GB ddr (forgot speed)
>
> motherboard I forgot, though I know it's based on nvidia's nforce
> chipset
>
> Software:
>
> myth 0.20
> linux kernel 2.6.17
> dvb drivers downloaded from pchdtv site
>
> I think xvmc is enabled; I'm using the Debian packages, which were
> configured with xvmc enabled. I enabled xvmc during myth setup.
>
> --
>
> Kurt Yoder
> http://yoderhome.com
>
> _______________________________________________
Hi Kurt,
Without XvMC using similar hardware specs (though I spend the extra
money to ensure quality, in the end it makes for a quality system that
I know will work right) I get about ~60-65% CPU doing 1080i playback
de-interlaced using Bob. WIth XvMC I see about 40-45%.
My specs are slightly different:
AMD64 3200+ (using a 32-bit install of Gentoo)
1GB DDR2
Asus M2NPV-VM (using the onboard GeForce 6150 chipset)
Nvidia 8776 or Nvidia 9629 Drivers
SATA-II (3gb/sec) WD Hard Drive
So, it may be any one of the slightly different/slightly better specs
of the systems I've assembled, but overall I don't see the difference
making 40-60% less CPU overhead. You may find that using a different
distro, or updating some packages by hand (especially ffmpeg and
MythTV) might make all the difference in the world.
The biggest difference from your brief description is that I use
Gentoo and build MythTV from source by hand. I don't know that it
would be *that* much of a difference getting all the juice from your
system, but it's possible I guess. There is another thread floating
around here right now about enabling XvMC and ensuring it's actually
enabled. One of the points I look for is that during playback when
the OSD comes up (press a button like 'i' for info) it's grayscale and
not color; grayscale means XvMC is enabled and is likely working (from
MythTV's perspective).
You mention that you have the 6200TC, from what I remember this means
that you've got shared video ram. It's possible (though unlikely) you
simply don't have enough RAM dedicated to video in the BIOS; though I
am not sure how you change that with an external card.
Good luck!
-Chad
--
Prebuilt HDTV capable systems at reasonable prices:
http://www.pauselivetv.com
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