[vdr] PCI fun (RGB/PAL over VGA at variable frame rate)

Theunis Potgieter theunis.potgieter at gmail.com
Wed Aug 27 15:08:14 CEST 2008


I found this to be useful for me, however I'm using PAL at 50Hz and not NTSC
colour encoding.

http://www.linuxis.us/linux/media/howto/linux-htpc/video_card_configuration.html

Nice background information.

On 17/08/2008, Thomas Hilber <vdr at toh.cx> wrote:
>
> On Sun, Aug 17, 2008 at 04:31:58PM +0100, Gavin Hamill wrote:
> > CPU usage rather than userspace. Due to the critical timing nature of
> > the patches, they need to have nearly the whole machine to themselves,
>
>
> the patches are time critical as far as xine itself must time the
> frames very accurately.
>
> Even my old 800Mhz Pentium with AGP-Radeon shows that indeed every
> 40000usecs +-35usecs a frame comes to Xserver's PutImage().
>
> It's by far not neccessary for the patches to work to get frames that
> accurately but it shows what is possible even on old and slow hardware.
>
> On Gavin's machine with PCI DMA problems we instead timed
> 40000usecs +-21000usecs a frame comes to the Xserver's PutImage().
>
> That is way too unstable. I think xine itself also can't cope with that.
> At least it will show heavy jerkyness.
>
> Nonetheless I today released a new version of the patches with 100%
> lesser sensivity to timing problems (see announcement of today).
>
> Cheers
>
>    Thomas
>
>
>
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