I remember someone on the DivX forum saying that B-frames use a higher quantizer for various reasons which I can't remember now nor understood at the time. As an example, using a constant quantizer of 2 will actually give B-frames with a quantizer of 4.
Though I don't know whether this is DivX specific, I wouldn't think so.
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It's funny, kicking everything in the room to pieces didn't help like I thought it would.
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