基于HTTP的动态自适应流媒体传输算法

HTTP-based dynamic adaptive streaming video transmission algorithm

采用实际的物理缓存大小作为视频缓存余量的计量方式,提出了一种基于物理缓存的自适应传输算法,该算法根据缓存占用率的大小以及网络估计吞吐量,动态地调整申请视频的码率。最后,分别在两种虚拟和两种实际的网络环境下进行性能测试。实验表明,本文算法可以降低视频码率对缓存变化的敏感度,可以避免视频码率过于频繁的切换,相比传统算法可以带来更好的用户体验。

Taking the actual physical cache as the measurement of the buffered video,an adaptive algorithm based on physical caching of the video is proposed.The algorithm adjusts the bitrate of the video according to the buffer occupancy rate and the estimated throughput of the Internet.The performance tests are conducted under two virtual network conditions and two real network conditions.The results show that the proposed algorithm can reduce the sensitivity of the video bitrate to the change of the buffer and avoid the buffer frequent fluctuation.Compared with the traditional algorithm,the proposed algorithm is superior in terms of Quality of Experience（QoE）.