[MPlayer-users] mencoder cropping does not work?
jknutar at nic.fi
Sun Jan 11 04:54:44 CET 2004
> > -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
~25fps, 1245.206 kbit/s, PSNR 48.14
~16fps, 1233.866 kbit/s, PSNR 48.69
let's test some more...
~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)
~25fps, 1336.927 kbit/s, PSNR 48.40
~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
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