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

[Michael Niedermayer]

Hi

On Saturday 05 June 2004 23:20, Matthias Wieser wrote:
[...]
> High motion scenes (with higher quantizer) with sky tend to produce
> block artifacts at the sky. It's understandable because the sky has
> nearly no detail but nevertheless it would need just a bit more bitrate
> than what mencoder allocates for the sky. If you use postprocessing the sky
> looks OK (a bit like blue plastic - with some noise it looks even better).
>
> IMHO there should be a possibility to tell mencoder or lavc "don't spend
> nearly all bits on those fast moving objects (nobody will see those details
> anyway) but reserve slightly more bits for seemingly simple flat areas
> like sky, streets, walls and so on. (Xvid mode ?) That would make mencoder/
> lavc more tolerant to people that don't / can't use postprocessing.
no u dont understand it, the blocking artefacts where even there at qp=2, 
thats the lowest lavc or xvid will use by default, so neither of them could 
give these blocks more bits

anyway the problem may be fixed already, the only video with blocking 
artefacts anyone uploaded, looks much better with latest lavc, but i dont 
have the source video, iam just comparing src-lavc-> vs src-xvid-lavc-> so a 
fair comparision isnt possible

[...]
-- 
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