[mythtv-users] pcHDTV - 2 questions

[Jarod C. Wilson]

On Nov 6, 2003, at 05:06, Doug Larrick wrote:

> On 11/06/03 01:35:16, Jarod C. Wilson wrote:
>> For starters, the GF4MX won't output any interlaced modelines, so 
>> 1920x1080i is out. My set doesn't do 720p, so that was out for me. 
>> Next step down is a 540p modeline, which is basically electronically 
>> equivalent to 1080i, if you do 1920x540p. However, I couldn't ever 
>> get that rez to take, so I backed off to 960x540p, and it works just 
>> fine. Everything gets scaled down a bit and you lose some definition, 
>> but the picture still beats the pants off S-Video and/or NTSC. From 
>> what I understand, 960x540p seems to be the norm for folks using 
>> GF4-class video cards w/HDTV, though you may have to tweak the sync 
>> pulse for your set. I'm pretty confident you'd be able to come up 
>> with a modeline that worked, derived from either mine or Ian Forde's.
>
> What he said.  I'll add that I *was* able to get 1920x540 to work on 
> my set -- just double the dotclock and all the horizontal paramaters.  
> Myth is not happy -- it's not scaling H and V separately for the video 
> out -- but I hope to work on fixing that.

Over a month later, I finally got around to trying out doubling the 
values like you said, and I did indeed get a mostly-working 1920x540 
modeline. I need to try one more thing, because I think the presence of 
my 960x540 modeline was setting a rez of 960x540, with a virtual rez of 
1920x540, so I had to scroll side-to-side like mad. I'm guessing 
pulling out the 960x540 altogether should fix that. Any word on 
adjusting Myth to scale H and V separately?

-- 
Jarod C. Wilson, RHCE

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