基于DSS的直播系统研究与实现

本文设计并实现了一个基于达尔文流媒体服务器(darwin streaming server,DSS)的直播系统,首先对DSS服务器的软件核心架构进行了研究分析,针对直播系统中UDP传输导致的网络拥塞现象和丢包问题,采用了基于RTCP反馈的拥塞控制方案,经过系统测试表明直播时的平均延时约为100 ms,画面质量总体清晰流畅,有效减轻了网络拥塞、降低了丢包;且通过CPU占用率测试表明随着用户的增多CPU占用率并未呈现明显增加,单用户情况下CPU占用率稳定在1％～3％,20个用户情况下CPU占用率稳定在6％～9％,说明系统并发处理性能较好.系统总体具有较好的性能,能够满足实际应用需求.

Research and implementation of living video system based on DSS

This paper designs and implements a living video system based on DSS.Firstly,the software core architecture of DSS server is analyzed.In view of the network congestion and packet loss caused by UDP transmission in living video system,the congestion control scheme based on RTCP feedback is adopted,After the system test shows that the average delay when living is about 100 ms,and the overall test picture is smooth,effectively reduce the network congestion and packet loss;and CPU occupancy rate test shows that with the increase in user CPU occupancy rate is not presented obviously increase,single user CPU occupancy rate stabilized between 1％ to 3％,20 users CPU occupancy rate stabilized between 6 ％ to 9 ％,indicating that the system concurrent processing performance is better.The overall system has a good performance,to meet the practical application needs.