[XviD-devel] a bug, I think

Radek Czyz radoslaw at syskin.cjb.net
Sat Mar 1 00:15:12 CET 2003


Hey,

I found a bug. If adaptive quantization is active and b-frames are
used, bframes have strange quantizers. For example two frames have an
average quantizer of 4..5 while a bframe between them has quant 13,
and that's with ratio 150% and offset 100...

I guess that lumimasking changes the quantizer for a frame to match
quantizer of first macroblock. That would be logical, BUT if b-frames
use this quantizer to compute their own, it's a bug.

Is it the case? I'll check that myslf tommorow, but if anyone can
give me a good answer or tip how to fix it, I'll be grateful.

Radek



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