[mythtv-users] VGA -> RGB-SCART (PAL, 720x576i50) on Intel HD video possible?

Hika van den Hoven hikavdh at gmail.com
Wed Jun 1 12:09:09 UTC 2016

Hoi Nick,

Wednesday, June 1, 2016, 10:04:27 AM, you wrote:

> I'm curious to know if it's possible to use (and thus if anyone is
using) a VGA->>RGB SCART output path on recent Intel Core-based systems
> with Intel HD (i915) video?

> Does the Intel HD video platform support outputting PAL-compatible
> 720x576i50 signals at 15kHz?

> Background:

> I've been using an old CRT with a frontend since 2006 and both are
> still working fine. The box uses an ATI Radeon 9000 card and a simple
VGA->>RGB cable (using composite sync), which produces a great quality
> image compared to S-Video or composite. The TV has no support for
> component video.

> However, the module support to drive the Radeon at a low enough
> dotclock to produce the PAL-compatible signal was removed in the X.org
> upgrade that is present in Debian 8.0 (Jessie), so this particular box
> is stuck on Wheezy (oldstable) and currently runs 0.27.6.

> Planning ahead, what I'd like to do is decouple the TV from this
> specific video card/cable - without sacrificing video quality - to
> permit retiring the box and replacing with something newer when
> necessary. If the TV fails first, there won't be a problem either way
> as the Radeon card supports DVI (if I decide to keep the frontend
> as-is, instead of replacing it).

> I'd like to retain the RGB SCART signal, so I'm looking for another
VGA->>RGB SCART solution (i.e. analog RGB, not a YPbPr component
> signal) that ideally does not need output a PAL-compatible 15kHz
> signal.

> However, if modern Intel HD video can be persuaded to output a
> PAL-compatible 720x576i50 15kHz signal (in the same way the Radeon
> card does) that would be great to know, as it would simplify the
> solution significantly.

> I can buy a cheap HDMI (or VGA) to component YPbPr converter but I
> would also need a YPbPr->RGBS converter. Most component/RGB converters
> I have found so far want to convert analog RGB _to_ component Yipper,
> rather than the other way around.

> Thanks for any information anyone can provide,

> Cheers,
> Nick
> _______________________________________________

If the card supports interlacing, it's a simple scheme to convert vga
to scart. All it has to do is combine hsync and vsync. I use it with
an nvidea card. If you are interested I can lookup the scheme. I also
have created my own modeline to optimize for my TV and to remove

Tot mails,
  Hika                            mailto:hikavdh at gmail.com

"Zonder hoop kun je niet leven
Zonder leven is er geen hoop
Het eeuwige dilemma
Zeker als je hoop moet vernietigen om te kunnen overleven!"

De lerende Mens

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