[XviD-devel] Dev-API-4 : Possibility to mark a defined area of the encoded picture as 'BLACK=0' , to encode BlackBars with absolute minimum of bitrate ?

[Edouard Gomez]

trbarry at trbarry.com (trbarry at trbarry.com) wrote:
> Since black in NTSC is not usually zero, what actual "black" YV12 values
> are recognized to qualify these macroblocks to be skipped? Any idea if
> it corresponds to the actual black bars found on DVD's or generated by
> the Avisynth AddBorders() function, etc?

What count in MPEG4 is frame  difference... so if your black is not that
black after  all, that does not hurt  as long as it  stays constant. And
there is  no "black MB"  recognition but there  is a zero  difference MB
detection (with thresholding, just a detail i won't comment here). These
MBs are skipped.

-- 
Edouard Gomez