本文選題：流媒體 + 視頻會議��； 參考：《北京交通大學(xué)》2014年碩士論文

【摘要】：隨著移動互聯(lián)網(wǎng)的迅速發(fā)展,為達到遠距離快速溝通和節(jié)約成本的目的,人們希望利用互聯(lián)網(wǎng)及移動互聯(lián)網(wǎng)的相關(guān)技術(shù)來實現(xiàn)視頻會議,因此遠距離的音視頻的同步交互成為新的溝通方式。在IT業(yè)界熱點技術(shù)中,視頻會議技術(shù)位居前列。 本文研究的是B/S軟件架構(gòu)視頻會議,通過瀏覽器訪問具有更好的跨平臺性和兼容性。采用最新的VP9編解碼技術(shù),比VP8編解碼效率高,以更低的帶寬成本提供更高質(zhì)量更高速率的視頻通信,使會議擁有更好的流暢性,非常適合移動終端的視頻會議模式。本文首先介紹了移動流媒體應(yīng)用系統(tǒng)結(jié)構(gòu)設(shè)計以及流媒體技術(shù)、視頻解碼技術(shù),然后討論了市場上常見的幾種視頻會議解決方案,并對它們的優(yōu)缺點進行了比較。本文重點討論了B/S軟件架構(gòu)視頻會議的系統(tǒng)結(jié)構(gòu)和關(guān)鍵技術(shù),開發(fā)中的關(guān)鍵技術(shù)包括HTML5、JavaScript、WebRTC,介紹了WebRTC的架構(gòu),闡述了音頻引擎VoiceEngine工作流程、WebRTC網(wǎng)絡(luò)擁塞控制和WebRTC傳輸安全。本文詳細闡述了WebRTC中所涉及到的NetEQ算法、AEC算法、VPx編解碼技術(shù),并設(shè)計了系統(tǒng)客戶端的架構(gòu)和視頻通信模塊。NetEQ模塊負責(zé)消除因網(wǎng)絡(luò)傳輸路徑和擁塞情況變化所造成的丟包和時延抖動的問題,AEC算法用于進行回聲的抵消,VP9編解碼效率高,是B/S軟件架構(gòu)視頻會議最佳的編解碼技術(shù)。本文最后詳細介紹了B/S視頻會議所采用的架構(gòu)和HTML5、JavaScript、CSS共三部分的代碼設(shè)計,闡述了RTCMulticonnection模塊和RecordRTC模塊代碼調(diào)用過程,成功實現(xiàn)了在局域網(wǎng)環(huán)境下的服務(wù)器配置和視頻通信過程。實驗表明了本文研究的可行性并取得了良好的效果。
[Abstract]:With the rapid development of mobile Internet, in order to achieve the purpose of long-distance and rapid communication and cost savings, people hope to use the Internet and mobile Internet related technologies to achieve video conferencing.Therefore, the synchronous interaction of long distance audio and video becomes a new way of communication.In the IT industry hot technology, video conferencing technology in the forefront.This paper studies the B / S software architecture video conference, which has better cross-platform and compatibility through browser access.Using the latest VP9 coding and decoding technology, it is more efficient than VP8 coding and decoding, and provides higher quality and higher rate video communication at lower bandwidth cost, which makes the conference have better fluency and is very suitable for the video conference mode of mobile terminal.This paper first introduces the architecture design of mobile streaming media application system, streaming media technology and video decoding technology, then discusses several common video conferencing solutions in the market, and compares their advantages and disadvantages.This paper mainly discusses the system structure and key technology of the B / S software architecture video conference. The key technologies in the development include HTML 5 / JavaScript Web RTC, introduces the architecture of WebRTC, and expounds the VoiceEngine workflow of audio engine, congestion control and WebRTC transmission security.In this paper, the NetEQ algorithm and VPx coding and decoding technology in WebRTC are described in detail.The architecture of the system client and the video communication module. NetEQ module are designed to eliminate the problem of packet loss and delay jitter caused by the change of network transmission path and congestion. The AEC algorithm is used for echo cancellation and VP9 coding and decoding efficiency.B / S software architecture video conferencing is the best coding and decoding technology.At the end of this paper, the architecture of B / S video conference and the code design of HTML 5 / JavaScript CSS are introduced in detail. The code transfer process of RTCMulticonnection module and RecordRTC module is expounded, and the server configuration and video communication process under LAN environment are successfully realized.The experimental results show that this paper is feasible and has achieved good results.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TN948.63

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