一种基于非实时操作系统的数字视频传输方法

Digital video transport based on unreal-time operation systems

视频服务器是非实时音视频节目的存储和播控设备,在非实时操作系统中,视频服务器改变了PCR在原始传送流中的时域位置,造成PCR抖动.对视频服务器来说,输出传送流的PCR校正是必须的.文章在分析影响MPEG-2系统同步因素的基础上,提出了解决非实时操作系统处理实时传输应用的积分流控模型和包近似等间距传输算法,并进行了视频服务器实时传输性能分析,实验结果证明该模型与算法是实用有效的,是高性能计算机处理实时音视频传输的理想解决方案.

A video server is the storage and output control device of unreal-time audio and video. Due to unrealtime operation systems of the video server, the position of the program clock reference （PCR） is shifted, which results in the PCR skewing. It is necessary for the video server to correct PCR in its output transport stream. Research was done on the key issues that impact MPEG-2 system synchronization. A model of integral flow control and a transport algorithm of approximate equidistance between packets were proposed for the real-time transport application based on the unreal-time operation systems. Mathematical analysis of the real-time transport performance for the video server under the unreal-time operation systems was also performed. Test results show that the model and algorithm are practical and effective to achieve the video and audio real-time processing for the video server.