[Mp4-tech] how does we should make good use of vbv buffer?

[jogging song]

Hi, experts
      VBV buffer allows us to modify bit rate according to picture content.
Rate control in JM first get the target bit for
current picture first.Then qp is obtained using the quadratic model. MAD of
current frame can be predicted from previous picture.
Why not adjust target bit for current picture according to current picture
content? In the rate control, what is the objective
for vbv buffer? Try to make it full always?
   Thanks.
Best Regards
Jogging
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