关键词: H.264, 可伸缩视频编码, 码率控制

Abstract: An adaptive inter-layer rate control scheme was proposed for H.264/AVC scalable extension. A switched model was put forward to predict the number of bits used for encoding inter frame either from the previous frame of the current layer or from the current frame of the previous layer. First, a Rate-Complexity-Quantization (R-C-Q) model was extended in scalable video coding. Second, the Proportional+Integral+Derivative (PID) buffer controller was adopted to provide the inter frame bit estimation according to the buffer state. Third, to achieve more accurate prediction when an abrupt change happens, the bit estimation was predicted from the actual bit of the current frame of the previous layer. Finally, a switched model was used to decide the bit estimation, and then the Quantization Parameter (QP) could be calculated according to the R-C-Q model. The simulation results demonstrate that the proposed algorithm outperforms JVT-W043 rate control algorithm by providing more accurate output bit rate for each layer, maintaining stable buffer fullness, reducing frame skipping and quality fluctuation, and improves the overall coding quality.

Key words: H.264, Scalable Video Coding (SVC), rate control