基于IP多播的多点会议中的视音频同步  

The Synchronization of Video and Audio in Multipoint Video Conference Based on IP Multicast

作　　者：陈晓春[1] 袁稹[1] 李建华[1] 

机构地区：[1]上海交通大学电子工程系,上海200030

出　　处：《计算机工程》2001年第1期154-156,共3页Computer Engineering

摘　　要：基于ＩＰ多播的多点会议中，视音频的同步至关重要，而ＩＰ技术本身的延迟特性以及ＵＤＰ传输协议的不可靠性，使得同步的解决存在一定的难度．针对设计的一套基于ＩＰ多播的多点会议系统，分析了其中的视音频同步的设计思想和实现过程，可靠传输情况下两点之间通信的简化模型，针对ＵＤＰ传输协议的不可靠性和实际中的多点通信的情况，提出了改进措施，并经实际验证，达到了良好的使用效果．The synchronization of video and audio is very important to multi-point video conference based on IP multicast. But it's difficult to solve this problem because of the characters of IP technology itself and the unreliability of UDP protocol. This paper is aimed at our own multi-point video conference based on IP multicast, analyzes its solution about synchronization. Firstly, we analyze the simple model of reliable point-to-point communication. Then, considering the fact that we are faced with the unreliable multi-point communication bssed on UDP protocol. we point out the modification based on the previous conclusions. After many times of validation, it can be said that the solution is very effective.

关 键 词：多媒体通信 多点视频会议 视音频同步 IP多播 

分 类 号：TN919.8[电子电信—通信与信息系统]