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

[Joe Votour]

Cory,

I've followed your posts on the circuit board that
you've made before - it interested me then, and it
interests me now.

Myself, I'm a software developer, and I've soldered a
grand total of one thing (a custom cable), and that
didn't even quite come out right (mind you, I just
don't have time to practice - it's on my list for
someday though).  As such, the chances of me building
one of these things from the schematics is slim to
none (right now).

Have you given thought to the minimum order that you
require for this, and the cost?  Depending on those
numbers, I'll sign up for one, maybe two (to have one
as a backup).

The no TV-out part until X is no problem for me, since
Fedora will start X fairly early in the boot process
anyway, and I can always hook up S-Video again anyway.

-- Joe

--- Cory Papenfuss <papenfuss at juneau.me.vt.edu> wrote:
> > 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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