[MPlayer-dev-eng] lavcopts PSNR comparison

[D Richard Felker III]

On Fri, Jun 11, 2004 at 11:47:38AM +0200, Romain Dolbeau wrote:
> Hello folks,
> 
> I've tried comparing some lavcopts to see If I was using the
> proper subset while encoding, to get the most out of a fairly
> low bitrate. So I tested 384 combinations, using a 5000 frames
> sequences 30 seconds in the european DVD of "Crouchen Tiger,
> Hidden Dragon". This is nowhere near as comprehensive as
> previous work, but still might be of interest to some...
> 
> Common options: "vcodec=mpeg4:vqmin=2:vqmax=31:keyint=125:vbitrate=650:"
> video filters: "-vf crop=720:432:0:72,scale=544:230"
> 
> Quick conclusions: vme=4 and vme=5 seems to be identical,
> mbd=2 is good, v4mv is good, trell is good, 1 bframes
> is good, qpel is good, and *cmp=2 is good.
> 
> Absolutely no surprises :-) (or is it :-( ?)
> 
> Is there any _useful_ options I missed ? (there's too may
> options in the man page to be able to test everything, in
> particular options with a float parameter :-)

Yes. qprd is definitely useful. mv0 and cbp might also be good. Also
different choices for *cmp... Can't think of other important ones..

Rich