[MPlayer-users] lavc vs. xvid (and improving lavc quality)

[D Richard Felker III]

On Wed, Jun 02, 2004 at 05:48:33PM +0300, Jan Knutar wrote:
> 
> > I never use postproc and I never see blocks. BTW perhaps you're
> > (stupidly) using vqscale= rather than bitrate/2pass encoding. There
> > may very well be a bug in the constant-quantizer code that's ruining
> > quality, since none of us who encode the right way (2pass) are
> > noticing any problem whatsoever...
> 
> Lavc makes it easy to shoot yourself in the foot:
> 
> -lavcopts vcodec=mpeg4:mbd=2:v4mv:trell:cbp:qprd:vqscale=2
> => Results in broken stream with lots of artifacts

Interesting. Are you using latest cvs? If so, please report the bug on
ffmpeg-devel.

> -lavcopts vcodec=mpeg4:mbd=2:v4mv:trell:cbp:vqscale=2
> => ok!
> -lavcopts vcodec=mpeg4:mbd=2:v4mv:trell:cbp:qprd:vbitrate=8000 (2 pass)
> => ok!

Hmm.

Rich