[mythtv-users] Myth 0.15.1 + FC2 + kernell 2.6.7 + pcHDTV andMCEPVR-250

William Lanfox wlanfox at hotmail.com
Tue Aug 17 03:20:45 EDT 2004

>From: Anthony Vito <anthony.vito at gmail.com>
>Reply-To: Discussion about mythtv <mythtv-users at mythtv.org>
>To: Discussion about mythtv <mythtv-users at mythtv.org>
>Subject: Re: [mythtv-users] Myth 0.15.1 + FC2 + kernell 2.6.7 + pcHDTV 
>Date: Thu, 12 Aug 2004 16:09:28 -0400
>ooo I forgot something...
>I recently recompiled back to 4k stacks and optimized the kernel for
>the Athlon since the latest Nvidia drivers are good with 4k stacks. I
>now can decode and scale full bandwidth 1080i with XvMC (FX5200) and
>not skip too much on the OSD... and the machine is only an
>XP2000(1.7Ghz).. even if you have the CPU it's worth it to optimize
>the kernel for your chips, gives a little breathing room.... I have a
>microATX Mobile XP 2600 build for this weekend.

Well over the weekend I upgraded to MythTV-CVS, and compiled it enabeling 
XvMC support, did the same for MythTV.0.15.1 what I got was actually a 
degregation on performance (more CPU usage) and the BW OSD.

Before compiling with XvMC I was seeing a ~70-79% cpu usage when watching 
LiveTV on KPBS-HD after compiling with XvMC I was getting ~80-90% cpu usage. 
The Nvidia driver I am using is: NVRM version: NVIDIA Linux x86 NVIDIA 
Kernel Module  1.0-6111  Tue Jul 27 07:55:38 PDT 2004.

I would of tought that it should use less CPU with XvMC... Any suggestions? 
BTW my kernel is compiled for my CPU which is a AMD XP 2500+.

Well I compiled back disabeling XvMC. The one think I noticed with myth-cvs 
as of 2004-08-15 is that there is more interlacing. Some one suggested to 
start the front end using "mythfrontend --verbose playback" too see if it 
detected interlace and the only things that looks inetersing is the 

2004-08-16 22:13:06 Using deinterlace method linearblend
2004-08-16 22:13:07 nVidiaVideoSync: VBlank ioctl did not work, 
unimplemented in this driver?
2004-08-16 22:13:07 DRMVideoSync: Could not open device /dev/dri/card0, No 
such device or ddress
2004-08-16 22:13:07 RTCVideoSync: Could not set RTC frequency, Permission 
denied                          .
2004-08-16 22:13:07 Using audio as timebase
2004-08-16 22:13:07 Video timing method: USleep with busy wait
2004-08-16 22:13:07 Refresh rate: 11765, frame interval: 33366

I "chmod a+wr /dev/rtc" and still the same issue. Has any one seen this or 
know how to fix it?


William Lanfox

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