[XviD-devel] B-frame "bugfix"

[Christoph Lampert]

Hi,

it's rather a "fixing the standard" than a "fixing XviD". 
Due to a stupid, stupid and once more stupid design flaw in the MPEG-4
standard, there were bad blocks in B-frames for some contents. 
The reason is that if a macroblock is skipped in a P-frame, it isn't 
encoded in the previous B-frames either, and there is no way around
this :-(  

To fix this, more work is needed, but I added a brute force flags

_DISABLE_SKIP  that disables SKIP-mode for P-frames completely.

Never use it if you want to do something useful, files will get bigger
without any gain in quality. 
But for B-frame testing it might be needed for the moment.
It's not defined automatically by -DBFRAMES, you'll have to give
an extra -D_DISABLE_SKIP. 

gruel (still mad at the MPEG-people!)

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