Scaling of LiveTV in MCE problem now solved
From: Stephen Neal (stephen.neal_at_nospam.as-directed.com)
Date: 02/13/05
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Date: Sun, 13 Feb 2005 13:02:15 -0000
I know I've become a bit boring in the past about this, but at last this
problem has been solved, though not by me. Major quality improvement for
those running VGA->RGB SCART
In the MCE registry settings there are a number of tweaks, to
increase/decrease the "safe area" margins in MCE (to keep the MCE menus away
from areas that are overscanned off-screen on a TV)
However there is also a converse tweak, that applies a degree of zoom/crop
to the LiveTV / Recorded TV (but not DVD or My Video it seems?) video to
simulate overscan when viewing on a non-overscanned display (like a PC
display). This is to avoid seeing the junk that broadcasters sometimes allow
on the very edge of their pictures. (ITV News Channel is a prime example -
nothing lines up on the left of frame)
*** WARNING ***
Before adjusting any Registry entry you should always accept that doing so
is at your own risk, and you should backup your registry for safety.
This overscan compensation was enabled on my set-up for some reason. In the
:"HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Media
Center\Settings\MCE.PerUserSettings" section of the registry, the
"optimizeFor" key was set to "ComputerMonitor" not "Television". This meant
that LiveTV was being zoomed in a small amount - but enough to cause quality
issues when de- and re-interlacing, as well as moving on-screen graphics
uncomfortably close to the edge of screen on sports and news channels.
By selecting "Television" MCE doesn't apply in any overscan compensation -
and if you are running a 1024x576 desktop, 16:9 576/50i stuff is displayed
with a 1:1 input to output line relationship with no scaling. This means
there is no zooming or cropping going on, and no scaling, which was causing
quite nasty banding artefacts on my set-up (Where de-interlacing wasn't
perfect and interlace artefacts scaled and then re-interlaced I got
occasional, quite nasty, vertical banding - especially on fast, major,
luminance changes - saying flash cameras on news footage, or flashing light
effects on Light Entertainment)
Thanks to "sanderton" on the XPMCE (and Tivo Community) forums for the work
in sorting this. Hurrah - MCE is now pretty near perfect in picture quality
terms. Now if only it didn't lose its DVB-T Guide to channel mapping
information...
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