[Openchrome-users] S-video CRT TV-OUT modes not resambling monitor size

[Anders Andersson]

This would be a nice bonus, but I don't think it's too limiting as it
is. I like overscan and it's a good thing that the chip allows you to
use the whole analog video signal instead of artificially limiting the
display window.

You can run into problems when other people are not aware of this, for
example some people that convert/record videos or movies don't know
about the 'safe' areas so the crop off the border, resulting in
missing information when displayed in full screen by a media player on
a CRT.

Also some video game emulators can have difficulties to add the
original border to the output. The reason I keep my 28" CRT is for
emulating video games, and to hook up my NES/SNES/Amigas so a "pixel
perfect" analog video signal with full overscan is very useful. My
dream would of course be a variable horizontal pixel clock so I can
get 100% correct aspect ratio when emulating the various old systems,
but as far as I know, the dot-clock is hardcoded in the chip.




On Thu, Jun 17, 2010 at 2:27 PM, Ivor Hewitt <ivor at ivor.org> wrote:
> Yeah as Anders says this is by design, that's overscan.
> There was some preliminary work done a while ago to make the overscan configurable, but it never got into a useful/usable state.
>
> On Wed, Jun 16, 2010 at 01:10:29AM +0200, Francesco Lotti wrote:
>> Hello.
>> I am using version 0.2.904 svn 853 with openchrome-revert_tvout_fixes_part_2.patch
>> applied on a CLE266. (VIA M12000 mini-itx running ubuntu karmic)
>>
>> I am not able to use 720x576Noscale at its best with TvOut (S-Video) hooked to an old CRT TV
>> (PAL) because the upper,lower,right and left parts of the screen fall outside the monitor for
>> roughly 40 lines each. Also 720x576Over behaves the same.
>> Other modes like 720x576 and 1024x768 "suffer" from the opposite problem,
>> leaving some black space around the screen resulting in a smaller usable area.
>>
>>
>> Same behavior with older 0.2.903 release.
>>
>> Any clues ?
>>
>>
>>
>> --
>> ciao
>> goo
>>
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