[mythtv-users] TV Output

Stephen Williams stephen.gw at gmail.com
Wed Dec 22 10:39:04 UTC 2004

Glad to hear you're making progress. The image really should be
centred, the signal is as close to spec as possible. Are you sure that
you haven't set Myth to recentre the image? You might have done that
for you're previous S-video out and haven't reverted it...

Assuming that's not the case you have two options (1) use Myth config
options to offset the display X and Y to centre the picture or (2)
mess with the modeline slightly to alter the front/back porch lengths
for both horizontal and vertical, just make sure you keep the sync
widths the same.

Option 1 would fix Myth put would still mean that other programs, e.g.
Mplayer/Xine/Ogle are off-centre. Option 2 requires a bit of
experimentation put would result in all programs being centred.


On Wed, 22 Dec 2004 10:00:27 +0000, Tom Hughes <tom at compton.nu> wrote:
> In message <1e71196a04122201534a69979b at mail.gmail.com>
>         Stephen Williams <stephen.gw at gmail.com> wrote:
> > As you noticed, Nvidia restrict some of the values in their modelines
> > to multiples of 8. Taking that into account this is the closest
> > possible modeline for 720x576 to the PAL spec:
> >
> > ModeLine "720x576pali" 13.875 720 744 808 888 576 581 586 625 -hsync
> > -vsync interlace
> >
> > If that doesn't give you a stable image then you have a different problem.
> Thanks for that - the horizontal values there are the same ones
> that I wound up but the vertical ones are slightly different.
> I did get a stable image in the end actually. It was a hardware
> problem after all - it helps if you connect the generated composite
> sync to the right pin on the SCART connector ;-)
> The image is a bit high and too far to the right at the moment but
> other than that it looks excellent and fills the screen nicely
> unlike the S-Video output.
> Tom
> --
> Tom Hughes (tom at compton.nu)
> http://www.compton.nu/

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