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Ok, I might be wrong.
All I know, that i-frame takes many times more bits than p- or b-frame at same quantizer.
And I was in such asumption, that the b-frame takes less bits than p-frame, when using same quantizer. Ok, I will try look more carefully.
When using virtual dub, there can be seen the video stream info, where the framesize can be seen.
Now, I might just imagine, but I can see from the graph, when there is b-frame. This is because there are for example two to three lower bars between a little higher ones (p-frames).
And when using same quantizer, there are still slightly lower consecutive bars between slightly higher bars (p-frames). But of course I should use statsreader to find out. Sorry or possible mis-information.
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