A.1. Video Buffering Verifier Mechanism
The idea of using a Video Buffering Verifier mechanism to bound the decoding complexity of a given set of bitstreams is not new, and it was already adopted in MPEG-1 Video [MPEG1-2] and MPEG-2 Video [MPEG2-2]. In these standards, the major purpose of the Video Buffering Verifier mechanism was to set some restrictions on the maximum variability of the number of bits per picture, especially in the case of constant bit-rate operation, and thus on the complexity of the encoded video streams.
Generically, the complexity of the encoded video is directly related to the encoded bit rate and to the decoded video data rate that the decoder generates (e.g., measured in terms of the number of MB/s). For frame-based ...
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