[mythtv-users] TV Output

Tom Hughes tom at compton.nu
Fri Dec 17 09:49:32 UTC 2004

In message <1e71196a041217013116c9fd02 at mail.gmail.com>
        Stephen Williams <stephen.gw at gmail.com> wrote:

> I have a very similar setup, DVB-T to a widescreen TV via a Geforce
> MX. I agree, the native TV out of the vid card is a little
> disappointing. Instead, quite a few people on this list (me included)
> are using home-built VGA -> SCART converters. Don't bother trying to
> buy one of these since they will all of the retail versions use scan
> conversion which really lowers the quality.

I was already planning to build one of those when I got the 
chance - apart from anything else the only spare S-Video input
on my TV is on the front but I have a spare RGB SCART input
on the back.

> Take a look at the following sites for details:
> http://www.hut.fi/Misc/Electronics/circuits/vga2tv/
> http://www.nexusuk.org/projects/vga2scart/index.php
> http://www.sput.nl/hardware/tv-x.html  
> Personally I went for the last site listed. This will give you RGB
> output to the TV, you can just output the raw interlaced DVB-T signal
> (no de-interlacing required) and each horizontal line of pixels
> generated by your vid card will map natively to a scan line on the TV.

I was looking at the nexusuk circuit, but the sput.nl one looks
the same anyway. Time to pay Maplins a visit I think...

> The image quality is fantastic, noticeably crisper than my Sony
> set-top-box using RGB output. You might be able to tweak the S-video
> output a little but it'll never come close.

I realised that the RGB output would be better but I didn't think
the S-Video output would be quite as bad as it is - like I say the
S-Video output from the DVD player is not bad at all. Certainly it
is much better than composite while the S-Video from the Myth box
looks no better (and maybe even worse) than the composite output
of a normal set top box.


Tom Hughes (tom at compton.nu)

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