Operation Modes
There are two operational modes of VBV: Constant Bit-rate (CBR) and Variable Bit-rate (VBR).
CBR - The decoder's buffer is filled over time at a constant data rate in the case of CBR. VBR - and at a non-constant rate in the case of VBR.
In both cases, data is removed from the buffer in varying chunks, depending on the actual size of the coded frames.
Read more about this topic: Video Buffering Verifier
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