[mythtv-users] hdtv modelines

[Greg Grotsky]

 The best thing to do, is hook up a windows machine and run Powerstrip. Then
you can flip through all the resolutions that windows detects, (I was able
to do about 45 different variations on my 1080p TV, each generated a
specific modeline).

Keep in mind that if you plan on using your myth machine to play games or do
stuff that's on in myth using DVI you will be overscanning the screen fairly
significantly. I was planning on doing everything over DVI on my setup but
out of the three TVs that I've tried (in my home) they all had over an inch
of overscan on all sides. This makes using the computer normally very
difficult because the menus and status bars are off the screen, it's also a
problem with games because of health and ammo meters. Anyway, I ended up
just going over the standard analog VGA cable so I could scale everything to
fit on the screen. I liked the idea of 1-to-1 pixel mapping and DAMN does it
look crystal clear but it wasn't worth it to me since half the time we're
playing games on it and it looks nearly crystal clear with the standard
D-Sub cable.

Hope this helps,
-Greg

On 10/1/05, Marius Schrecker <marius at schrecker.org> wrote:
>
> > Hi,
> >
> > Next thing to set up is my xorg.conf for dvi out.
> >
> > I have to say I'm very confused about how dvi modelines work. I've never
> > used anything other than analogue monitors before.
> >
> > Perhaps someone can correct my assumtions as I ramble along:
> >
> > My tv will support 480p-60Hz, 576p-50Hz, 720p-50Hz, 720p-60Hz,
> 1080i-50Hz
> > and 1080i-60Hz.
> >
> > I'm guessing that non-interlaced is generally better, right? So my best
> > resolution would then normally be 720p-60Hz, but what about when I'm
> > watching interlaced material, like analog tv signals? Is it better to
> let
> > the tv or myth do the deinterlacing?
> >
> > The analog resolutions the tv supports are 1024x768, 1280x768, 1360x768
> > and 1366x768. Am I right in assuming bigger is better here?... I think
> ati
> > cards hve a divider of 4 right? So 1368x768 is about as close to 16:9 as
> I
> > can get.
> >
> > Don't know if I need to be thinking of this, or whether I should just
> pick
> > a standard hdtv modeline.
> >
> > I looked at this page:
> >
> http://www.linuxis.us/linux/media/howto/linux-htpc/video_card_configuration.html
> >
> > Wish there were a little more description about what each modeline
> > actually does.
> >
> > I don't have a hdtv source at the moment, so ATSC means little, sources
> > are analog tv 'PAL' dvd (mostly PAL) and whatever I happen to have lying
> > around in mythvideo.
> >
> > Can someone point to a better site where the modelines are explained?
> >
> > Thanks
> >
> > Marius
>
> Looking further at generating modelines, I tried to use videogen , but
> need to know the max dotclock of my video adapter. Googled til I'm blue
> but can't find anything.
>
> How do I ascertain the max dotclock of a card (Connect3d Radeon X300 256
> MB)?
>
> Marius
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