Real-Time VBR Rate Control of MPEG Video based upon Lexicographic Bit Allocation
✍ Scribed by Dzung T. Hoang
- Publisher
- Elsevier Science
- Year
- 1999
- Tongue
- English
- Weight
- 267 KB
- Volume
- 5
- Category
- Article
- ISSN
- 1077-2014
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✦ Synopsis
Real-Time VBR Rate Control of MPEG Video based upon Lexicographic Bit Allocation T he MPEG-2 Video Standard describes in detail a bitstream syntax and a decoder model but leaves many details of the encoding process unspeci®ed, such as encoder bit-rate control. The standard de®nes a hypothetical decoder model, called the Video Buering Veri®er, that can operate in either constant-bit-rate or variable-bit-rate modes. In this paper, we present a low-complexity algorithm for variable-bit-rate control suitable for low-delay, real-time applications. The algorithm is motivated by recent results in lexicographic optimal bit allocation. The basic algorithm switches between constant-quality and constant-bit-rate modes based on changes in the fullness of the decoding buer in the Video Buering Veri®er. We show how the algorithm can be applied either to produce a desired quality level or to meet a global bit budget. Simulation results show that the algorithm compares favorably to the optimal lexicographic algorithm.