[mythtv-users] DVI or HDMI to Composite video

Dale Pontius DEPontius at edgehp.net
Sun Jul 5 00:01:13 UTC 2009

Allen Edwards wrote:
> On Fri, Jul 3, 2009 at 9:19 PM, Leigh Sharpe <lsharpe at pacificwireless.com.au
>> wrote:
>> Does your TV have S-VHS input? If so, you should be able to use an nVidia
>> Ge-Force card with S-VIDEO out. I do, and it works a treat.
>> I can see from some of the documentation that the X Config has a
>> 'composite' option for these cards, but I'm not sure how you would hook it
>> up. This page may have some tips:
>> http://www.weethet.nl/english/video_connect_pc2tv.php
>> Leigh.
>> ----- Original Message ----- From: "Tom Sparks" <tom_a_sparks at yahoo.com.au
>> To: "Discussion about mythtv" <mythtv-users at mythtv.org>
>> Sent: Saturday, July 04, 2009 1:25 PM
>> Subject: [mythtv-users] DVI or HDMI to Composite video
>> I am looking at get a computer for my mythtv setup
>> the output option are DVI or HDMI
>> I want to be able to connect it to a TV that has Composite inputs (the tv
>> is not HD)
>> How many step of conversion do I need to do for DVI and HDMI to composite?
>> tom_a_sparks
> Get a video card like an Nvidia 6200 with S-Video output.  You can buy and
> S-Video to Composite adapter for 84 cents
> http://www.monoprice.com/products/product.asp?c_id=104&cp_id=10401&cs_id=1040105&p_id=79&seq=1&format=2
> this will be much better than trying to convert from RGB, which would be
> easier than converting from DVI.
> I have an RGB to S-Video converter that was several hundred dollars and it
> is crap compared to what I get out of my 6200 card.
> That said, that was a long time ago and for $27 you might just try one of
> these.  Moneyback guarantee and good reviews.
> http://www.monoprice.com/products/product.asp?c_id=101&cp_id=10114&cs_id=1011407&p_id=4724&seq=1&format=4#feedback
But then again, I have an nVidia 8400GS, using the component video out.

It is NOT satisfactory, because the nVidia outputs excessive overscan.
There used to be a way to adjust, but no more.  MythTV can adapt, and
I've set the graphics card to 800x600 then grabbed what I can with the
Myth setup wizard.  But that means that the 480-line video is no longer
at native resolution - it's getting interpolated, and quality suffers.

I've also tried fiddling a little with modelines, but from what I've
read, when the TV-out is active, modelines are ignored.

If anyone has experience with this gizmo, is it possible to use custom
modelines to get an exact (CRT) screen-filling picture at native resolution?

I have a schematic of an analog VGA-component video converter, but it
would probably cost more than one of these gizmos.  It was also hi-def,
and would take some adaptation for stock NTSC.

Dale Pontius

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