[mythtv-users] HD performance problems

[Shawn Rutledge]

On 11/20/06, Tom Lichti <tom at redpepperracing.com> wrote:
> Along with all that, I would check that your modeline is setup with the
> correct frequency for your area. NTSC requires a multiple of 30, when my
> system was using an unknown frequency (close to PAL I think) I got tons
> of prebuffer pauses, hiccups, etc, playing HD on a dual core P4 2.8GHz,
> which should have been more than capable of playing HD. When using XvMC,
> the mythfrontend log will show the average FPS of the display. If it's
> not running near your TV standard, you WILL get prebuffer pauses and
> audio/video sync problems. Mine was running at around 24 FPS average,
> and the playback was terrible. Once I got my modeline correct and it was
> running at 30 FPS (or very close to it, either 29.9 or 30.1) playback is
> perfect, even without XvMC. I actually have less CPU usage without XvMC
> than with it, and that is with BOB de-interlace on.

Yes, in Xorg.0.log I see:

(**) NV(0): *Default mode "640x480": 25.2 MHz, 31.5 kHz, 60.0 Hz
(II) NV(0): Modeline "640x480"   25.20  640 656 752 800  480 490 492
525 -hsync -vsync