[MPlayer-users] Chroma interpolation

[D Richard Felker III]

On Mon, Mar 01, 2004 at 09:00:38PM +0200, Ville Saari wrote:
> On Sun, Feb 29, 2004 at 08:23:23PM -0500, D Richard Felker III wrote:
> 
> > > -vf scale=-1:1200
> > 
> > Using scaling like this is very inefficient. In order to get the
> > chroma nice enough to look good, you have to scale luma a lot! The
> > following will give you the exact same quality with much better speed:
> > 
> > -vf scale=-1:600,format=yuy2
> 
> Almost same quality, but not exactly. That would cause the final luma
> to be scaled twice in vertical dimension, which generally causes somewhat
> poorer quality than scaling in single step.
> 
> However that was just an example of what I would have expected if the
> hardware would really have used different scaling algorithms for different
> dimensions as you said. I can't use any software scaling as a solution
> to my problem, because playing PAL DVDs already uses practically all of
> my CPU. Soft-telecined NTSC leaves some spare CPU, but not much.

Try -vf ilpack. If you use a direct-vidmem-access vo driver (e.g.
vidix or mga_vid) and -dr, it's very fast.

Rich