[MPlayer-dev-eng] -vc ffmpeg2 speedup trick

[Michael Niedermayer]

Hi

try '-lavdopts idct=4'

the reason why this is faster then the default idct is that the default one 
checks for zero coefficients, which are _very_ common to avoid useless 
calculations, but the dequantization used in mpeg2 messes with the least 
significant bit of coefficient 63, which causes it to be non zero very 
often ...

-- 
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