[mythtv-users] How I got great quality TV-out on my nVidia MX4000

[Cory Papenfuss]

> Don't hold out on us Corey, do tell more.  :-)  I'm assuming you built
> something that converts interlaced vga to s-video using some kind of
> s-video encoding silicon?
>
 	I've mentioned what I did in the past, starting with
http://www.gossamer-threads.com/lists/mythtv/users/45910#45910 
Basically built up the circuit in the AD724 datasheet.  It's a 
surface-mount chip, and circuit layout is a little important (a few MHz 
bandwidth video signal), so I make a PCB.  I've thought of making a 
slightly nicer one (with VGA loop, though, etc).  If there were enough 
interest I suppose I could finish it off and send off for a limited run of 
PCBs.

>>   No scaling done, just build the
>> proper modeline and see tvout the way it was meant to be.
>
> Sounds nice.
>
 	Yeah, except that you get garbage until X comes up.  The VGA on 
bootup is basically 480p, which doesn't exactly work on S-vid.  Aside from 
that detail, it's great.

-Cory

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