[mythtv-users] anyone tried a vga -> scart adapter for watching TV ?

Cory Papenfuss papenfuss at juneau.me.vt.edu
Thu Oct 21 12:31:42 UTC 2004

 	If you check the archives, you'll see a number of posts I've made 
in the past regarding the device.  It's basically the same as a few of the 
designs on the 'net using an AD724 chip.  Bring in RGBHV at 
15.7kHz/29.9Hzi and it spits out NTSC-encoded CVBS and S-VID.

ModeLine     "coryntsci" 14.3 720 760 824 910 480 484 492 525 interlace

 	Video adapter is complicated due to bugs in the drivers on a 
number of them.  Finding a bugless one that support Xv and interlaced 
reduces the number of useable cards.  I'm currenly using an old ATI Mach64 
for that reason.


* Cory Papenfuss							*
* Electrical Engineering candidate Ph.D. graduate student               *
* Virginia Polytechnic Institute and State University 			*

On Thu, 21 Oct 2004, cythraul wrote:

> Hi Cory,
> I'd be interested to know more about what you use to convert vga to
> s-video signal. I've been looking into this for a while now as an
> alternate solution to the poor tv-out quality that my MX440 outputs.
> Until I can get my G550 running on tvout, it sounds like such a device
> would be ideal.
> Also, what modeline are you using? And on which video adapter?
> Thanks!
> cythraul
> On Thu, 21 Oct 2004 07:28:29 -0400 (EDT), Cory Papenfuss
> <papenfuss at juneau.me.vt.edu> wrote:
>>> Has anyone expirience with this (or a similar) solution ?
>>        I'm in the US (non-SCART), but built a similar creature to convert
>> the VGA signal into an NTSC-encoded S-vid signal.  Aside from video card
>> driver bugs with interlacing and the fact that you can't see "normal" VGA,
>> the picture quality is excellent.  You need to use *exact* modeline
>> timings for the video standard you are using.
>>        I suspect that quality complaints from people are due to poor
>> quality construction.  Bad circuit layout will definately affect video
>> picture quality.
>> -Cory

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