[Ffmpeg-devel] Re: [MPlayer-users] PSNR tests: mbd=2, mv0, trell, and cbp (and other stuff)

[Michael Niedermayer]

Hi

On Monday 13 October 2003 09:43, Tuukka Toivonen wrote:
> On Fri, 10 Oct 2003, Corey Hickey wrote:
> >[Automatic answer: RTFM (read DOCS, FAQ), also read DOCS/bugreports.html]
>
> Looks like Pine doesn't allow me to quote more than this one line...
> anyway...
>
> I made some tests with mencoder/libavcodec using different set of
> options and the results are here:
>
> http://www.ee.oulu.fi/~tuukkat/mplayer/tests/tt-test1/readme.html
very nice page :)))

[...]
> Here are the conclusions from the tests:
>
>
> In this investigation, we learned that slightly better quality usually
> requires much more computation in MPEG-4. Simply the best options are:
>
> mencoder -mc 0 -noskip -skiplimit 0 -nosound -ovc lavc -lavcopts
> vcodec=mpeg4:vhq:trell:mbd=2:vmax_b_frames=1
vhq is the same as mbd=1

>
> :v4mv:vb_strategy=0:vlelim=0:vcelim=7:cmp=6:subcmp=6:precmp=6:predia=3:dia=
> :3:vme=4
>
> (except that you should probably use vcelim=0 instead of 7, although it
yes, i also dont remember ever seeing a PSNR gain from v?elim != 0, maybe 
theres a subjective quality gain

btw, mv0 should be tested with mbd=2, as it may produce bad results otherwise, 
but i didnt test it so maybe iam wrong, same is true for 4mv to a smaller 
extend

[...]
-- 
Michael
level[i]= get_vlc(); i+=get_vlc();		(violates patent EP0266049)
median(mv[y-1][x], mv[y][x-1], mv[y+1][x+1]);	(violates patent #5,905,535)
buf[i]= qp - buf[i-1];				(violates patent #?)
for more examples, see http://mplayerhq.hu/~michael/patent.html
stop it, see http://petition.eurolinux.org & http://petition.ffii.org/eubsa/en