[MPlayer-users] seeking explanation of -1 and -2 in -vop scale

[D Richard Felker III]

On Wed, Sep 18, 2002 at 07:42:27PM +0200, Stefan Baehre wrote:
> [Automatic answer: RTFM (read DOCS, FAQ), also read DOCS/bugreports.html]
> SMuelas wrote:
> 
> > > a 720x576 vob, 16:9 aspect, cropped with 710:434:4:74, and then to be 
> > > scaled with w=640 and y to well.... be right!
> > > 
> > Do not crop to w=710. Try to find a multiple of 16, or, at least, 8.
> 
> Why? It's important for the codec, but it shouldn't be for the
> scaler. Or am I wrong here? Anyway, the output of the scaler should
> be multiple of 16, but that's the case with 640.

Right.