| 一种基于非实时操作系统的数字视频传输方法 |
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| 引用本文： | 杨晓君,苗彦超,郭黎利,孙凝晖.一种基于非实时操作系统的数字视频传输方法[J].哈尔滨工程大学学报,2005,26(6):777-780. |
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| 作者姓名： | 杨晓君 苗彦超 郭黎利 孙凝晖 |
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| 作者单位： | 哈尔滨工程大学,信息与通信工程学院,黑龙江,哈尔滨,150001;中国科学院,计算技术研究所,北京,100080;中国科学院,计算技术研究所,北京,100080;哈尔滨工程大学,信息与通信工程学院,黑龙江,哈尔滨,150001 |
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| 基金项目： | 国家“863”高技术研究发展计划基金资助项目(863-306-ZD-01-04-4) |
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| 摘 要： | 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.
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| 关 键 词： | 视频服务器 传送流 节目时钟基准 |
| 文章编号： | 1006-7043(2005)06-0777-04 |
| 收稿时间： | 2004-09-07 |
| 修稿时间： | 2004年9月7日 |
Digital video transport based on unreal-time operation systems |
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| YANG Xiao-jun,MIAO Yan-chao,GUO Li-li,SUN Ning-hui.Digital video transport based on unreal-time operation systems[J].Journal of Harbin Engineering University,2005,26(6):777-780. |
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| Authors: | YANG Xiao-jun MIAO Yan-chao GUO Li-li SUN Ning-hui |
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| Affiliation: | 1. School of Information and Communication Engineering, Harbin Engineering University, Harbin 150001, China; 2. Institute of Computing Technology, Chinese Academy of Sciences, Beijing 100080, China |
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| Abstract: | A video server is the storage and output control device of unreal-time audio and video.Due to unreal-time 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. |
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| Keywords: | video server transport stream program clock reference(PCR) |
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