[MPlayer-users] VP6 support?

[Matthias Wieser]

Am Mittwoch, 11. Februar 2004 13:49 schrieb D Richard Felker III:
> On Wed, Feb 11, 2004 at 10:40:52AM +0100, Matthias Wieser wrote:
> >
> > > When comparing PSNR values with lavc and xvid, using mencoder,
> > > which of xvid's min, avg, max values should you compare with, i.e.,
> > > which one is it that lavc prints out? :)
> >
> > What about using
> >
> > mplayer -vo png orig.avi [...]
> > mplayer -vo png xvid.avi [...]
> >
> > pngtopnm ...
> >
> > pnmpsnr orig1.pbm xvid1.pbm
> > pnmpsnr orig1.pbm lavc1.pbm
> > [...]
> >
> > Then you are able to use video filter,...
>
> This will also measure the psnr of rgb<-yuv->rgb conversion, which is
> not desirable.

What would be better?

It's true that -vo png introduces some "noise" because of yuv->rgb 
conversion. But the original avi, the xvid and the lavc avi are handled 
the same way.
If the difference between a png from the xvid avi and a png from the 
original avi is less than the difference between the png from the 
original avi and the png from the lavc avi, then the xvid avi is probably 
better than the lavc avi.

If you don't measure the differences, you have to do some subjective 
comparisons. That's what doom9 did.