多媒体可信宽带网可靠性测试与分析系统的设计与实现

发布时间：2018-03-21 13:02

本文选题：可靠性测试　切入点：多媒体网络　出处：《电子科技大学》2014年硕士论文　论文类型：学位论文

【摘要】：随着互联网技术和通信技术的不断发展以及网络带宽的不断改善,集成了视频、音频和数据的流媒体数据的实时传输技术已经成为了业界广泛关注及研究的一个热点,它不但改变了人们的教育、娱乐甚至生活方式,也使得IP网络越来越趋于复杂化和多样化。这就要求IP网络具有更高的网络业务可靠性。但是由于多媒体网络具有固有的高度复杂性、异构性和动态性等特性,使得对多媒体网络整体的业务可靠性的特征及行为的测试与分析变得日益困难。本文通过对现有的网络可靠性测量技术、多媒体网络可靠性计算与分析方法的研究,设计并实现了一个多媒体网络可靠性测试与分析系统,同时对其实现的关键技术进行了详细的研究与分析。多媒体网络可靠性测试与分析系统采用C/S模式,由流媒体服务器、前端视频采集设备和流媒体客户端三部分组成,通过对对多媒体网络中传输的数据包进行捕获及分析,利用数据包分析处理模块、可靠性统计分析模块及视频播放模块,实现了视频的实时播放功能,并最终实现了从客观和主观两方面对多媒体网络可靠性测量与分析工作。首先,对影响多媒体网络可靠性的主要因素以及评价多媒体网络视频质量的评估方法进行了详细的研究,最终选择了基于MDI的视频质量分析模型来对多媒体网络的可靠性进行评估。其次,通过对网络传输协议的分析比较,最终选用RTP协议作为多媒体网络可靠性测试与分析系统的传输协议,并且深入分析了RTP/RTCP协议的数据包格式及特点。同时也详细的研究了WinPcap数据包捕获技术、多媒体同步技术、网络拓扑测量技术及VLC技术,为对多媒体网络可靠性的测量提供了坚实的理论基础。再次,本文对多媒体网络可靠性的分析及计算方法进行了深入和详细的研究,最终提出了一种综合可靠性评价方法,也就是综合利用基于MDI的视频质量分析模型中的丢包率及时间延迟两个指标参数对多媒体网络可靠性进行评估,相较于目前的网络可靠性分析方法,综合可靠性评价方法更加全面且可信。接着,本文设计并实现了多媒体网络可靠性测试与分析系统,其中多媒体网络可靠性测试与分析系统包括三个组成部分:流媒体服务器端、前端视频采集端、流媒体客户端。主要实现了RTP包分析处理模块、RTCP包处理模块及可靠度分析统计模块、NTP同步模块以及SNMP数据包处理模块。最后,本文通过对整个系统进行测试,并将客户端的测试结果与使用WireShark测试所得的测试结果进行对比及分析,最终表明了系统的分析结果能够准确地反映多媒体网络的可靠度及当前运行状态。
[Abstract]:With the continuous development of Internet technology and communication technology and the continuous improvement of network bandwidth, the real-time transmission technology of streaming media data, which integrates video, audio and data, has become a focus of attention and research in the industry. It not only changes the way people educate, entertain and even live, It also makes the IP network more and more complex and diversified, which requires the IP network to have higher network service reliability. However, due to the inherent high complexity, heterogeneity and dynamic characteristics of multimedia network, It is becoming more and more difficult to test and analyze the characteristics and behaviors of the service reliability of the multimedia network as a whole. In this paper, the existing network reliability measurement techniques, the methods of computing and analyzing the reliability of multimedia network are studied. A multimedia network reliability test and analysis system is designed and implemented, and the key technologies of the system are studied and analyzed in detail. The front-end video acquisition equipment and the streaming media client are composed of three parts. Through capturing and analyzing the data packets transmitted in the multimedia network, the data packet analysis and processing module, the reliability statistical analysis module and the video playback module are used. The real-time video playback function is realized, and the reliability measurement and analysis of multimedia network are realized from both objective and subjective aspects. The main factors affecting the reliability of multimedia network and the evaluation method of video quality in multimedia network are studied in detail. Finally, the video quality analysis model based on MDI is selected to evaluate the reliability of multimedia network. Secondly, through the analysis and comparison of network transmission protocols, Finally, RTP protocol is selected as the transmission protocol of the multimedia network reliability test and analysis system, and the format and characteristics of the RTP/RTCP protocol are analyzed in depth. At the same time, the technology of WinPcap packet capture and multimedia synchronization is also studied in detail. Network topology measurement technology and VLC technology provide a solid theoretical basis for the measurement of multimedia network reliability. Thirdly, this paper makes a deep and detailed study on the analysis and calculation methods of multimedia network reliability. Finally, a comprehensive reliability evaluation method is proposed, which is to evaluate the reliability of multimedia network by using the two parameters of packet loss rate and time delay in the video quality analysis model based on MDI. Compared with the current network reliability analysis method, the comprehensive reliability evaluation method is more comprehensive and reliable. Then, this paper designs and implements the multimedia network reliability test and analysis system. The multimedia network reliability test and analysis system includes three parts: streaming media server, front-end video acquisition, Streaming media client. It mainly implements RTP packet processing module, reliability analysis and statistics module, NTP synchronization module and SNMP packet processing module. Finally, the whole system is tested in this paper. The test results of client and WireShark are compared and analyzed. The results show that the system can accurately reflect the reliability and current running state of multimedia network.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TP393.06

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