Real-time H.263+ Frame Rate Control Algorithm for Low Vbr Video

H.263+ is an emerging video compression standard for the low bit rate visual communication. Up to now, most H.263+ rate control algorithms, especially that in the test model of the near-term (TMN), focus on macroblock level bit allocation and low latency under a constant-frame-rate and constant-bit-rate (CBR) channel. As expected, these algorithms are not capable of handling the transmission bandwidth uctuation and the video quality can be degraded seriously. In this work, we propose a new H.263+ rate control scheme which supports the variable bit rate (VBR) channel through the frame rate adjustment. In particular, a fast realization of encoding frame rate control based on motion information within the sliding window is developed to e ciently pursue the tradeo between spatial/temporal qualities. Experimental results are provided to demonstrate the superior performance of the proposed scheme.