本文選題：可靠性測試　切入點：多媒體網(wǎng)絡(luò)　出處：《電子科技大學》2014年碩士論文　論文類型：學位論文

【摘要】：隨著互聯(lián)網(wǎng)技術(shù)和通信技術(shù)的不斷發(fā)展以及網(wǎng)絡(luò)帶寬的不斷改善,集成了視頻、音頻和數(shù)據(jù)的流媒體數(shù)據(jù)的實時傳輸技術(shù)已經(jīng)成為了業(yè)界廣泛關(guān)注及研究的一個熱點,它不但改變了人們的教育、娛樂甚至生活方式,也使得IP網(wǎng)絡(luò)越來越趨于復(fù)雜化和多樣化。這就要求IP網(wǎng)絡(luò)具有更高的網(wǎng)絡(luò)業(yè)務(wù)可靠性。但是由于多媒體網(wǎng)絡(luò)具有固有的高度復(fù)雜性、異構(gòu)性和動態(tài)性等特性,使得對多媒體網(wǎng)絡(luò)整體的業(yè)務(wù)可靠性的特征及行為的測試與分析變得日益困難。本文通過對現(xiàn)有的網(wǎng)絡(luò)可靠性測量技術(shù)、多媒體網(wǎng)絡(luò)可靠性計算與分析方法的研究,設(shè)計并實現(xiàn)了一個多媒體網(wǎng)絡(luò)可靠性測試與分析系統(tǒng),同時對其實現(xiàn)的關(guān)鍵技術(shù)進行了詳細的研究與分析。多媒體網(wǎng)絡(luò)可靠性測試與分析系統(tǒng)采用C/S模式,由流媒體服務(wù)器、前端視頻采集設(shè)備和流媒體客戶端三部分組成,通過對對多媒體網(wǎng)絡(luò)中傳輸?shù)臄?shù)據(jù)包進行捕獲及分析,利用數(shù)據(jù)包分析處理模塊、可靠性統(tǒng)計分析模塊及視頻播放模塊,實現(xiàn)了視頻的實時播放功能,并最終實現(xiàn)了從客觀和主觀兩方面對多媒體網(wǎng)絡(luò)可靠性測量與分析工作。首先,對影響多媒體網(wǎng)絡(luò)可靠性的主要因素以及評價多媒體網(wǎng)絡(luò)視頻質(zhì)量的評估方法進行了詳細的研究,最終選擇了基于MDI的視頻質(zhì)量分析模型來對多媒體網(wǎng)絡(luò)的可靠性進行評估。其次,通過對網(wǎng)絡(luò)傳輸協(xié)議的分析比較,最終選用RTP協(xié)議作為多媒體網(wǎng)絡(luò)可靠性測試與分析系統(tǒng)的傳輸協(xié)議,并且深入分析了RTP/RTCP協(xié)議的數(shù)據(jù)包格式及特點。同時也詳細的研究了WinPcap數(shù)據(jù)包捕獲技術(shù)、多媒體同步技術(shù)、網(wǎng)絡(luò)拓撲測量技術(shù)及VLC技術(shù),為對多媒體網(wǎng)絡(luò)可靠性的測量提供了堅實的理論基礎(chǔ)。再次,本文對多媒體網(wǎng)絡(luò)可靠性的分析及計算方法進行了深入和詳細的研究,最終提出了一種綜合可靠性評價方法,也就是綜合利用基于MDI的視頻質(zhì)量分析模型中的丟包率及時間延遲兩個指標參數(shù)對多媒體網(wǎng)絡(luò)可靠性進行評估,相較于目前的網(wǎng)絡(luò)可靠性分析方法,綜合可靠性評價方法更加全面且可信。接著,本文設(shè)計并實現(xiàn)了多媒體網(wǎng)絡(luò)可靠性測試與分析系統(tǒng),其中多媒體網(wǎng)絡(luò)可靠性測試與分析系統(tǒng)包括三個組成部分:流媒體服務(wù)器端、前端視頻采集端、流媒體客戶端。主要實現(xiàn)了RTP包分析處理模塊、RTCP包處理模塊及可靠度分析統(tǒng)計模塊、NTP同步模塊以及SNMP數(shù)據(jù)包處理模塊。最后,本文通過對整個系統(tǒng)進行測試,并將客戶端的測試結(jié)果與使用WireShark測試所得的測試結(jié)果進行對比及分析,最終表明了系統(tǒng)的分析結(jié)果能夠準確地反映多媒體網(wǎng)絡(luò)的可靠度及當前運行狀態(tài)。
[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.
【學位授予單位】：電子科技大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TP393.06

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本文編號：1643965