流媒体直播(时移)系统的设计

The Design of Live(Time-shift) Streaming System

随着多媒体技术的发展和宽带网络的普及,流媒体技术得到越来越广泛的应用,其中,尽管流媒体直播技术定位于提供实时流服务,然而,国内外现有直播系统均未能很好解决直播系统的实时性与用户的个性化需求之间的矛盾。针对这个问题,首先设计了一个具有完全自主知识产权的支持时移功能的流媒体直播系统,并创新地采用一种实现时移的时间计算方法。目前该系统已成功应用于上海网络电视试点的大宁模式中。

Due to the real-time characteristic, live streaming applications attract more and more attentions. Most existing llve streaming applications provide streaming clients with the same data at the same time, which do not match with each user＇ s requirement, In this paper, a novel software architecture is proposed which can be used to implement a time-shifting live streaming system. Besides, this paper also proposes a novel algorithm to calculate the play time for the time-shlfting system. At last, a system based on the proposed architecture and algorithm has been developed and deployed successfully in Shanghai Darting iPTV（internet-protocol television） systems.