[MPlayer-cvslog] CVS: main/libmpcodecs vf_scale.c,1.62,1.63

[Oded Shimon]

On Fri, Feb 24, 2006 at 02:56:21PM +0100, Diego Biurrun wrote:
> On Wed, Feb 22, 2006 at 06:40:20PM +0200, Oded Shimon wrote:
> > On Wed, Feb 22, 2006 at 12:44:34PM +0100, Diego Biurrun wrote:
> > > 
> > >   <noup>
> > >     Disallow upscaling past the original dimensions.
> > >       0: off (default)
> > >       1: on
> > 
> > You should probably mention that it downscales dimentions seprately, and I 
> > think, this can even break aspect ratio... For prescaled mpeg video etc.
> 
> Elaborate..

Original:  480x480
Prescaled: 640x480 (aspect ratio)

scale=512:-2:noup=1

scale:     512x384
...noup:   480x384

Break of aspect ratio...




Also an intentional break of aspect ratio will give a different "break" 
than intended:

original:   640x480

scale=1280:240:noup=1 (intentional break aspect ratio by a factor of 4)

after noup: 640x240   (aspect ratio only broken by factor of 2...)

- ods15