动态网络环境下的音视频同步技术  

Synchronization of Audio and Video in Dynamic Network

作　　者：南春辉[1] 李博[1] 武颖[1] 

机构地区：[1]中北大学电子测试技术国家重点实验室仪器科学与动态测试教育部重点实验室,太原030051

出　　处：《计算机系统应用》2012年第11期120-122,178,共4页Computer Systems & Applications

摘　　要：针对网络传输中由于延迟、抖动、网络传输条件变化等因素引起的音视频不同步的问题,设计并实现了一种适应不同网络条件的音视频同步方案.利用音视频编码技术AMR-WB和H.264具有在复杂网络环境中速率可选择的特性,结合RTP时间戳和RTCP反馈检测QOS,通过控制音视频编码方式,实现了动态网络环境下的音视频同步方案.重点介绍了可靠网络环境和动态网络环境下同步算法的设计过程,并通过实际测试验证了此方案的可行性.结果表明,此方案能够保证不同网络环境中的音视频同步.In view of the problem that audio and video are not synchronized, which is caused by factors such as delay, shaking and the change of network condition in transmission, this paper designs a solution for the synchronization of audio and video which adapts to different network. By use of the property of various rates of the codee AMR-WB and H.264,and RTP time stamp and RTCP feedback detection QOS, this synchronization scheme is realized by controlling the codec of audio and video. In the paper, the design process of synchronization algorithm which works in reliable and dynamic network is emphasized, and the feasibility of the scheme is verified through actual test. The results show that this design can guarantee the synchronization of audio and video in different network environment.

关 键 词：音视频同步 时间戳 RTP/RTCP 

分 类 号：TN919.8[电子电信—通信与信息系统]