[vdr] Re: AW: overscan area

[Lutz Pressler <Lutz.Pressler@SerNet.DE>]

On Mon, 22 Jul 2002, Alessio Sangalli wrote:

> Lutz Pressler wrote:
>
>
> > That's ok, but I don't think that this depends (only) on TV set
> > adjustment. I've got a 16:9 set, so when viewing 4:3 material (as with
> > DvbPic - it would be nice to be able to select 16:9 sometimes :)),
>
> I have to investigate, how to put the dvb card in 16:9 mode and how to
> deal with it
Fine. VDR is doing it for 16:9 material.
>
>
> > left and right borders are not hidden - and there are no parts missing
> > on the left and right margins when viewing video, I think.
>
> *there are*, try with xawtv, as I already wrote, you'll enjoy a much
> bigger area.
Yes, I was wrong in that point.
>
>
> > Top and bottom are on the edge of visible region, but quite exact.
> > Aspect ratio is wrong also, which indicates missing horizontal parts, too.
>
> wait - if you watch on a 16:9 set the image is stretched, but this has
> nothing to do with this problem, for now.
That's not what I mean. TV is in 4:3 mode when viewing pictures with
DvbPic. I readjusted the TV set a little bit - and now the visible region
is (measured) quite exactly 4:3 (or 16:9 in 16:9 mode).
For testing, I took a 4:3 DVD with a circular logo - and did a measurement
in still picture mode: width=height.
But when viewing my example JPEG img_106 with a circular window on it
(which is almost exactly circular when measured in pixels (or on the
notebook LCD)), width ~= 1.07 * height. That's around 768/720 = 1.067,
which may be cause of the "problem".
As a second test, I also connected the video output of my digital
camara with the source photo(s) to the TV. There are small nonvisible
margins at the left and right (but also on the top and bottom) -
but the aspect ratio is correct, and the nonvisible areas are noticiably
smaller than with DvbPic.

Hope this helps,
  Lutz

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