[MPlayer-dev-eng] autoexpand patch

[D Richard Felker III]

On Sat, Nov 13, 2004 at 05:00:39PM +0100, Romain Dolbeau wrote:
> Dominik 'Rathann' Mierzejewski wrote:
> 
> >>That's normal behavior. the 720:576 DVD contains an aspect
> >>ratio (here 16/9, hence 1024:576) at which the DVD must be
> >>played.  Unfortunately, when you expand the image with
> >>-vf expand, the image is first expanded, and *then* the
> >>final display aspect ratio is computed.
> >>
> >>So for a 720:576 image at 16:9, that's 1024:576 final, and the
> >>width will be expanded by (1024/720) ~= 1.42 You pad the
> >>image with black by asking for 1024 at 4:3, so the image is padded
> >>to 1024:767 (rounding error ?), and *then* the width is multiplied
> >>by ~1.42, and so display at 1456:767
> >
> >In other words, it's not a bug, it's a feature? :(
> 
> I'd say, it's an implementation side-effect. Aspect-ratio resizing
> is handled by telling the vo what is required, so it can be done in
> hardware, while the various video filter are called before that.
> Unless vf expand has access to the movie aspect ratio, no way
> this can be done, IMHO.

it does. d_width and d_height.

rich