[MPlayer-users] mencoder cropping does not work?

[Jan Knutar]

> > -ovc lavc -lavcopts vcodec=mpeg4:mbd=2:v4mv:vqscale=2
>
> Why not qscale=1?

Sure, but only #ifdef _PURIST :)

> > better quality, but slower:
> >
> > -ovc lavc -lavcopts vcodec=mepg4:mbd=2:v4mv:vqscale=2:trell
>
> As I understand it, this would be "lower filesize, but slower" and
> not "better quality, but slower".

It's both, according to psnr values :)

reencoding with above options some short avi to mpeg4
Without trell:
~25fps, 1245.206 kbit/s, PSNR 48.14
With trell:
~16fps, 1233.866 kbit/s, PSNR 48.69

let's test some more...
vcodec=mpeg4:vqscale=2
~42fps, 1252.492 kbit/s, PSNR 47.82
the same, with vqscale=1
~41fps, 1252.492 kbit/s, PSNR 47.82 (hm, that's strange)
vcodec=mpeg4:vqscale=1:mbd=2:v4mv
~25fps, 1336.927 kbit/s, PSNR 48.40
vcodec=mpeg4:vqscale=1:mbd=2:v4mv:trell
~16fps, 1419.456 kbit/s, PSNR 49.41 (trell increases both filesize and 
quality with qscale=1?)

vqscale=1 didn't behave the way I expected :\ Didn't think it would be 
such a small bitrate increase, and no difference at all without mbd and 
v4mv..