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

[Michael Niedermayer]

Hi

On Sunday 30 May 2004 07:06, Evgueni V. Gavrilov wrote:
> In article <20040530005848.GU26953 at brightrain.aerifal.cx> of mplayer-users
> you wrote:
>
> DRFI> Anyway this is interesting if it's correct. At same quant, the two
> DRFI> should give comparable bitrates.
> this comparison isn't correct because by default lavc doesn't create
> B-frames, but xvid does.
>
> here is a small example:
>
> $ mencoder -dvd-device /big/Video/Star\ Wars/Episode\ II\ -\ Attack\ Of\
> The\ Clones dvd://7 -chapter 4 -endpos 30 -oac mp3lame -ovc xvid
> -xvidencopts fixed_quant=3:psnr -vf filmdint -fps 29.97 -ofps
> 23.976023976024 -noautoexpand -o test.xvid
>
> $ cq psnr_115135.log
> 1:            57            7.96%           2.81%
> 2:           189           26.40%          18.67%
> 3:           290           40.50%          42.96%
> 4:           180           25.14%          35.56%
>
> VIDEO:  [XVID]  720x480  24bpp  23,976 fps  1774,5 kbps (216,6 kbyte/s)
>
> $ mencoder -dvd-device /big/Video/Star\ Wars/Episode\ II\ -\ Attack\ Of\
> The\ Clones dvd://7 -chapter 4 -endpos 10 -oac mp3lame -ovc lavc -lavcopts
> vqscale=3:psnr -vf filmdint -fps 29.97 -ofps 23.976023976024 -noautoexpand
> -o test.avi
>
> $ cq psnr_115322.log
> 3:           719          100.00%         100.00%
>
> VIDEO:  [DIVX]  720x480  24bpp  23,976 fps  948,6 kbps (115,8 kbyte/s)
>
> $ ls -l test*
> -rw-r--r--  1 aquatique  wheel  4369446 30 ÍÁÊ 11:53 test.avi
> -rw-r--r--  1 aquatique  wheel  7474052 30 ÍÁÊ 11:52 test.xvid
>
> shots, psnr files and video available on
> http://aquatique.rusunix.org/qscale/
could u upload the source video, so the problem could be reproduced & fixed?

btw, the blocking is visible with -vf eq2=0:8:2 without it i dont see any, spp 
also fixes it while spp filtered xvid lookes worse (note, all with eq2, 
without it the whole thing isnt really vissible here)

-- 
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