【摘要】：當(dāng)今社會(huì)，隨著各種企業(yè)和單位對(duì)于運(yùn)營(yíng)效率的日益看重，傳統(tǒng)的會(huì)議模式已經(jīng)難以滿足當(dāng)前需求，由此包括PSTN電話會(huì)議、視頻會(huì)議等在內(nèi)的虛擬會(huì)議得到快速發(fā)展。其中PSTN電話會(huì)議是一個(gè)純語音會(huì)議平臺(tái)，位于不同地點(diǎn)的人只需要通過手機(jī)、固定電話撥打電話會(huì)議平臺(tái)的接入號(hào)就可以實(shí)現(xiàn)多方會(huì)議功能。視頻會(huì)議[2]是指不同的用戶或者用戶群，利用計(jì)算機(jī)采集聲音、視頻或者文件數(shù)據(jù)信息，然后通過網(wǎng)絡(luò)傳送給各個(gè)用戶，從而達(dá)到有效的實(shí)時(shí)互動(dòng)或者溝通。與此同時(shí)視頻監(jiān)控在安全領(lǐng)域得到了快速發(fā)展，比如對(duì)生產(chǎn)現(xiàn)場(chǎng)、重點(diǎn)場(chǎng)地、會(huì)場(chǎng)等的管理監(jiān)控，往往在一些跟生產(chǎn)現(xiàn)場(chǎng)等有關(guān)的會(huì)議中需要將監(jiān)控視頻能夠切入到視頻會(huì)議中，方便進(jìn)行指揮調(diào)度。因此將視頻會(huì)議與PSTN電話會(huì)議、監(jiān)控平臺(tái)進(jìn)行融合構(gòu)建一個(gè)有效的融合視頻會(huì)議不僅能夠豐富會(huì)議加入的形式，而且能夠適應(yīng)指揮調(diào)度的應(yīng)用場(chǎng)景。 考慮到加入會(huì)議的方便性，市場(chǎng)上Flash的占有率巨大，基本上瀏覽器都支持并安裝了該插件，因此對(duì)于大部分用戶來說，基本上實(shí)現(xiàn)了零下載零安裝，因此本文的研究課題建立在基于Flash的融合視頻會(huì)議基礎(chǔ)上。目前比較熱門的支持Flash的流媒體服務(wù)器主要有FMS（Flash Media Server）和Red5兩種，但是FMS是商業(yè)化的多媒體系統(tǒng)，其代碼采是非公開的，因此二次開發(fā)很困難，再加上它的價(jià)格也是非常昂貴，成本高。因此本文采用可以進(jìn)行二次開發(fā)、研究成本低的開源的Red5媒體服務(wù)器為平臺(tái)。監(jiān)控平臺(tái)的網(wǎng)絡(luò)攝像頭基本都是基于RTSP協(xié)議，而Red5目前僅支持RTMP，，本文需要對(duì)Red5的網(wǎng)絡(luò)通信模塊進(jìn)行擴(kuò)展，增加協(xié)議轉(zhuǎn)換模塊使其支持RTSP。 本文首先對(duì)已有的PSTN電話會(huì)議、監(jiān)控平臺(tái)進(jìn)行簡(jiǎn)要介紹，然后從整體上闡述web融合會(huì)議框架設(shè)計(jì)和功能業(yè)務(wù)設(shè)計(jì)。接著，深入研究了Red5框架，構(gòu)建會(huì)議服務(wù)器并且設(shè)計(jì)實(shí)現(xiàn)了協(xié)議轉(zhuǎn)換模塊的關(guān)鍵技術(shù)，包括RTSP協(xié)議棧、RTP解包技術(shù)、RTSP-RTMP流廣播設(shè)計(jì)實(shí)現(xiàn)，丟幀策略以及改進(jìn)，H.264視頻格式封裝成flv格式。 最后本文對(duì)web融合視頻會(huì)議進(jìn)行了功能測(cè)試和性能測(cè)試。功能上，融合視頻會(huì)議能夠?qū)崿F(xiàn)視頻互通、與電話會(huì)議語音互通、切入監(jiān)控視頻、電子白板等。性能上主要是從改進(jìn)后丟幀策略的有效性、網(wǎng)絡(luò)帶寬等參數(shù)來驗(yàn)證Red5會(huì)議服務(wù)器擴(kuò)展的協(xié)議轉(zhuǎn)換模塊的性能。通過測(cè)試表明，本文設(shè)計(jì)的融合視頻會(huì)議能很好的應(yīng)用到實(shí)際項(xiàng)目中。
[Abstract]:In today's society, with the increasing importance of various enterprises and organizations for operational efficiency, the traditional conference model has been difficult to meet the current needs, so virtual conferences, such as PSTN teleconferencing, video conferencing and so on, have been developed rapidly. Among them, PSTN teleconferencing is a pure voice conference platform, where people in different locations only need to dial the access number of the conference platform via mobile phone and can achieve multi-party conference function by dialing the access number of the telephone conference platform. Video conference [2] refers to different users or groups of users, using the computer to collect sound, video or file data information, and then transmit to each user through the network, so as to achieve effective real-time interaction or communication. At the same time, video surveillance has developed rapidly in the field of security, such as the management and monitoring of production sites, key sites, conferences and so on. It is often necessary to cut the surveillance video into the video conference in some meetings related to the production site, so as to facilitate the command and scheduling. Therefore, combining video conference with PSTN teleconferencing and monitoring platform to construct an effective fusion video conference can not only enrich the join form of conference, but also adapt to the application scenario of command and scheduling. Considering the convenience of joining the meeting, the market share of Flash is so large that the browser basically supports and installs the plug-in, so for most users, zero download and zero installation is basically achieved. Therefore, the research topic of this paper is based on the converged video conference based on Flash. At present, there are two popular streaming media servers that support Flash: FMS (Flash Media Server) and Red5, but FMS is a commercial multimedia system, its code acquisition is not public, so the secondary development is very difficult. Plus its price is very expensive, high cost. Therefore, this paper uses a low-cost open source Red5 media server as a platform for secondary development. The webcam of monitoring platform is basically based on RTSP protocol, but Red5 only supports RTMP, at present. This paper needs to extend the network communication module of Red5 and add protocol conversion module to support RTSP.. In this paper, the existing PSTN conference call and monitoring platform are introduced briefly, and then the design of web converged conference framework and functional business are described as a whole. Then, we deeply study the Red5 framework, construct the conference server and design and implement the key technologies of the protocol conversion module, including RTSP protocol stack, RTP unpacket technology, RTSP-RTMP stream broadcast design and implementation, frame dropping strategy and improvement. H.264 video format encapsulated into flv format. Finally, the function test and performance test of web converged video conference are carried out. Function, converged video conference can realize video interworking, voice interworking with teleconferencing, cut in surveillance video, electronic whiteboard and so on. In terms of performance, the performance of the protocol conversion module extended by Red5 Conferencing Server is verified mainly from the parameters such as the effectiveness of the improved frame dropping strategy and the network bandwidth. The test results show that the fusion video conference designed in this paper can be applied to the actual project very well.
【學(xué)位授予單位】：華南理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TN948.63

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