[vdr] [OT] development infrastructur for VGA2SCART patch set

Thomas Hilber vdr at toh.cx
Mon Mar 2 09:40:34 CET 2009


On Mon, Mar 02, 2009 at 10:03:12AM +0200, Pasi Kärkkäinen wrote:
> Hmm.. so you get 50 Hz interlaced output with this xorg.conf.
> 
> Are you able to sync to each field separately?

of course not on nVidia graphics. They haven't offered their specs for 
us to implement that.

But nevertheless this modeline gives smooth PAL playback because the 
display (a SCART device) inherently plays 50Hz. 

The major disadvantage of missing capability to have sync to field
is: you must deinterlace by software. Though you use an interlaced VGA
output. And software deinterlacers as we all know cause bad picture 
quality.

Sync to separate fields currently only works with ATI Radeon and 
Intel i9xx chipsets. That's what FrameRateControl (FRC) is based 
upon in the patches mentioned above. This way you can cease from 
deinterlacing in software giving you an artifact free picture.

- Thomas




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