[vdr] Any really working HD video output systems for VDR?

Thomas Hilber vdr at toh.cx
Fri Jun 5 15:42:02 CEST 2009


On Fri, Jun 05, 2009 at 11:17:54AM +0200, jori.hamalainen at teliasonera.com wrote:
> It would mean that no judder and studder on HD-quality. With VDPAU
> the problem still might be "50Hz vs 50.02Hz" -thing so you cannot get
> frame accurate display. With every 5 seconds you might have duplicated
> display of frame or dropped frame. This is not acceptable by my

I fully agree. The *only* way to overcome this is by synchronizing VGA
video timing to DVB-stream clock.

I realized this for some ATI-Radeon and Intel-GMA hardware. Even the
brandnew Intel D945GSEJT now is fully supported with VGA/SCART/DVI/HDMI
output.

For further details see:

http://lowbyte.de/vga-sync-fields/
http://vga2scart.gw90.de/
http://www.easy-vdr.de/git?p=frc.git/.git;a=summary
git clone git://www.easy-vdr.de/git/frc

> This gives exact 50Hz 1080p mode. But does your VGA-cards internal clock
> generator allow
> exactly 148.500MHz. If VGA can only generate f.ex 148.460MHz clock then you

with vga-sync-fields patch you always have *exactly* 50Hz since video clock
frequency is dynamically controlled and corrected.

> have 49.99Hz
> output signal. Also is pulse width divisable by 8 etc.

this restriction is no longer true for Intel 945Gxx hardware.

cheers
   Thomas




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