Used a microsoft encoder, amongst others.
This issue has appeared across several encoders, which leads me to think it is not encoder related.
My feeling is that there seems to be inherent issues with the Bidirectional frame in the wmv standard.
MPEG4 uses 1 bit for SKIPed macroblocks in P frames, and 0 bits for NOT_CODED macroblocks in B frames. This results in bit reduction when presenting the B frame feature into quiet scenes.
WMV uses 1 bit for SKIP in P frames, and 2 (!) bits for DIRECT SKIP in B frames.
NK
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