[mythtv-users] MythTV / HDTV: DVI vs S-Video Interface Suggestions

Jarod C. Wilson jcw at wilsonet.com
Sun Nov 2 01:53:37 EST 2003


On Oct 31, 2003, at 5:22 PM, Doug Larrick wrote:

> On 10/31/03 15:27:50, George Heeres wrote:
>
>> Obviously there are the S-Video options:
>> Then there are straight VGA output options:
>>   - Use VGA to Component (Y-Pb-Pr) Output
>>   - Use DVI to DVI cable
>
> For HD content, the only way you're gonna get HDTV resolutions is via 
> VGA or DVI.  S-video is limited to 480i, which is fine (even great) 
> for standard-def programming.
>
> I use the Key Digital VGA-to-component adaptor that you linked to.  A 
> little pricey, but does a nice job.  It simply does colorspace 
> conversion, no resolution or timing conversion at all -- this is nice 
> because then you have total control of overscan, etc. via the 
> modeline.
> I am connecting to a Sony KV-34XBR800, which is just about identical 
> to your set.  I tried for a month or so to get DVI working, but the 
> set does *not* send the proper DVI handshaking to get the card to 
> output resolutions it likes.  With the component converter, even the 
> BIOS and VGA-mode console show up properly on the set.

I use an Audio Authority 9A60, which does more or less the same thing 
as the Key Digital adapter. Some claim the KD is a bit higher quality, 
while the AA is #2 on the list, but the AA lists for about $100, versus 
at least twice as much for the KD. I'm perfectly happy w/my AA.

> Bear in mind that nVidia cards (with XvMC) do *not* support interlaced 
> modes; I was unable to find another modern card that definitely does 
> under X, either.  So for 1080i you are stuck with 540p, either 960x540 
> for square pixels or 1920x540 for a pseudo-1080i resolution.  I think 
> with the new filtering code being put in we may find a way to do 
> "cheat" deinterlacing by sending the sequential fields as 1920x540 
> frames @ 60 Hz.  720p is converted internally (in the set) to 1080i, 
> so is also not ideal.

I found the only rez I could get to work (with a Panasonic 47" HDTV and 
a GF4MX) was 960x540p, but it still looks very nice -- worlds better 
than S-Video (you can't tell much difference on standard-def TV, but 
you can on movies and HD content.

-- 
Jarod C. Wilson, RHCE

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