[XviD-devel] new Chroma_opt option review

[elcabesa]

hi
i'm testing chroma opt opt adn found that it help not compression, i always 
get file big than the one made without the option enable.
i think this problem is due to you try flat very dark area and very light ones 
in image. 
i think that this souhld be done only if  there are more than x % of chroma 
pixel inside a macroblock that are dark or light.
this is what i mean
the code is now in cvs  take image and flat chroma in dark area (y<16) and 
light area( y>235). this make some dark area inside a macroblock flat, and 
couse you have a non flat MB with a smal flat area  when you do FDCT , this 
give more coefficent.

i think that filtering in dark area or light area shgould be done only if a MB 
has 70% of pixe dark or light.  this way most of the MB is made flat nad you 
reduce high freq coefficents after FTCT

nowaday , the result is only a bigger filesize (0.1% i think =) ) couse very 
dark and verly light area are very few

bye