HLS直播流媒体传输系统的冗余优化

Redundancy Optimization in Live Streaming Transmission System

对HTTP Live Streaming深入研究之后,发现该协议在直播流媒体传输过程中存在视频流索引文件重复传送的问题。详细阐述了服务器与客户端之间的交互过程,并通过对网络监控软件的使用,检测到交互过程中服务器传输给客户端的视频流索引文件存在较大的冗余,造成网络带宽开销增大。提出一种可行的改进方案,在.m3u8文件中添加一个#EXT-X-MEDIA-SEQUENCE-LAST标签,并使服务器和客户端都对该标签进行识别。通过对网络占用率的对比分析,改进后的方案对网络带宽的占用率明显减小,进而验证了该改进方案的可行性。

After in-depth study on the HLS, it is found that HLS has the problem in the video streaming transmitted repeatedly aspect of the index file in live streaming process. Specifically addressed the interaction process between the server and the client, for using network monitoring software, video streaming index files are detected that there is a large redundancy when the server transmits to the client in the interactive process, resulting in the increased network bandwidth overhead. A viable improvement program is proposed, to add a #EXT-X-MEDIA-SEQUENCE-LAST tag in the .m3u8 file. making the label identified by the server and the client. Through comparative analysis, the occupancy rate of the network bandwidth, the occupancy rate of the network bandwidth are significantly reduced in the improved program, verify the feasibility of the improved program.