一种基于HTTP自适应流的混合码率自适应算法

doi:10.11896/j.issn.1002-137X.2017.02.019

Abstract

Abstract: The rate-adaptation algorithm is the hotspot and difficulty in adaptive HTTP streaming(AHS).In this paper,we proposed a hybrid rate-adaptation algorithm (Combined with Bandwidth and Buffer,CBB) for adaptive HTTP streaming.It is designed at the application layer using a “probe” principle to estimate the real-time bandwidth and avoid frequent switching of video rate.Then an exponential weighted moving average smoother (EWMA) is applied in bandwidth smoothing procedure.The smoothing factor can vary with the client buffer status to reduce buffer overflows.The schedule strategy is designed to keep buffer level in a balanced range as far as possible.The whole algorithm includes estimating,smoothing,quantizing and scheduling.These four steps proceed to form a circular closed-loop.The algorithm has been verified on the MPEG-DASH standard reference platform-libdash,and the experiments show that our algorithm performs well under varying network conditions.

Key words: AHS,Rate control,Network bandwidth,Buffer state,MPEG-DASH

XIONG Li-rong, LEI Jing-zhi and JIN Xin. Hybrid Rate Adaptation Algorithm for Adaptive HTTP Streaming[J].Computer Science, 2017, 44(2): 129-134.

References

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