[Mp4-tech] How is Max CPB size determined?

[jogging song]

Hi, all
In Annex A Profiles and Levels, there is a table Table A-1 - Level limits.
I don't understand how the value of Max CPB size  is determined.
The value of Max CPB size is relevant to Max Vide bit rate, does an equation
exit between them?
Or there are other factors which influences the calculation of Max CPB size.
The VBV buffer or Virtual buffer is the Max CPB size, right?
Are there any proposals about the calculation of Max CPB size?
Thanks in advance.
Best Regards.
Liwei Song
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