[mythtv-users] overscan problems with nvidia 8400 GS

[Tortise]

Relevant Wikipedia references are

http://en.wikipedia.org/wiki/720p

"720p has a widescreen aspect ratio of 16:9, a vertical resolution of 720 pixels and a horizontal resolution of 1280 pixels, or 
1280x720, for a total of 921,600 pixels." and

http://en.wikipedia.org/wiki/1080i

"The term usually assumes a widescreen aspect ratio of 16:9, implying a horizontal resolution of 1920 pixels and a frame resolution 
of 1920 × 1080 or about 2.07 million pixels."

I've not introduced the additional complexity of frame rates, that is also potentially an issue, however getting the promised pixels 
is indisputably a black and white issue.  Either you are getting them or you are not.

Mathew it depends on what your HD native resolution is, if it is 576i or 720p then it will have to be scaled, that not unreasonable 
in itself and works well - especially when the overscanning is turned off - if the capability is there.

I've calculated a 5% edge deficit overscanned equates to 19% of the image missing and not seen!  Would you accept 19% less pay - if 
you knew about it?



----- Original Message ----- 
From: "Matthew Harrison" <lists at mwharrison.co.uk>
To: "Discussion about mythtv" <mythtv-users at mythtv.org>
Sent: Monday, July 13, 2009 10:31 AM
Subject: Re: [mythtv-users] overscan problems with nvidia 8400 GS


{...}

I wonder how consistent modern sets are. I've not dug out the relevant
standards to check, but Wikipedia has this interesting nugget on the
following page.

http://en.wikipedia.org/wiki/Overscan

"With the accuracy attainable with digital type displays (e.g. plasma
<http://en.wikipedia.org/wiki/Plasma>, LCD
<http://en.wikipedia.org/wiki/LCD> etc.), the area presented to the
viewer is precisely defined. For 1080i or 1080p material only the
central 1776x1000 pixels are presented to the viewer. For 720p material
it is only the central 1152x648 pixels."

I hope that doesn't mean that I have to scale HD video up in order to
correctly display it on my 1920x1080 LCD.
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