H.323同步控制实现研究  

An implementation of media synchronization in H.323

作　　者：贾杰 常义林[1] 杨付正[1] 许延[1] 

机构地区：[1]西安电子科技大学ISN国家重点实验室,陕西西安710071

出　　处：《通信学报》2004年第5期67-74,共8页Journal on Communications

基　　金：高等学校博士学科点专项科研基金资助项目(20010701006);华为基金资助项目;西安电子科技大学ISN国家重点实验室基金资助项目

摘　　要：提出并实现了一种H.323多媒体通信系统音视频同步控制算法,算法以正常语音播放为基准,利用H.263码流语法信息,通过调整视频播放帧率实现媒体间同步, 不增加通信冗余度。实际测试结果表明,算法有效地提高了多媒体通信系统音视频媒体同步性能和多媒体的感知服务质量,并已应用于实际多媒体通信系统。An algorithm of synchronization is described between audio and video in H.323 multimedia communication system. The algorithm makes use of the value TR extracted from the syntax of H.263 to regulate playout frame rate of video sequence related with nominal audio playout rate. Real system has been performed and none redundancy is added. Results confirm that the proposed algorithm effectively improves the synchronization between audio and video and the perceptual QoS in multimedia communication system as well. It has been applied in real multimedia communication systems.

关 键 词：H.323 多媒体通信系统 视频 音频 媒体间同步 

分 类 号：TN915.01[电子电信—通信与信息系统]