基于流媒体视频会议移动终端的系统研究

发布时间：2018-04-12 13:56

本文选题：流媒体 + 视频会议　；参考：《北京交通大学》2014年硕士论文

【摘要】：随着移动互联网的迅速发展,为达到远距离快速沟通和节约成本的目的,人们希望利用互联网及移动互联网的相关技术来实现视频会议,因此远距离的音视频的同步交互成为新的沟通方式。在IT业界热点技术中,视频会议技术位居前列。本文研究的是B/S软件架构视频会议,通过浏览器访问具有更好的跨平台性和兼容性。采用最新的VP9编解码技术,比VP8编解码效率高,以更低的带宽成本提供更高质量更高速率的视频通信,使会议拥有更好的流畅性,非常适合移动终端的视频会议模式。本文首先介绍了移动流媒体应用系统结构设计以及流媒体技术、视频解码技术,然后讨论了市场上常见的几种视频会议解决方案,并对它们的优缺点进行了比较。本文重点讨论了B/S软件架构视频会议的系统结构和关键技术,开发中的关键技术包括HTML5、JavaScript、WebRTC,介绍了WebRTC的架构,阐述了音频引擎VoiceEngine工作流程、WebRTC网络拥塞控制和WebRTC传输安全。本文详细阐述了WebRTC中所涉及到的NetEQ算法、AEC算法、VPx编解码技术,并设计了系统客户端的架构和视频通信模块。NetEQ模块负责消除因网络传输路径和拥塞情况变化所造成的丢包和时延抖动的问题,AEC算法用于进行回声的抵消,VP9编解码效率高,是B/S软件架构视频会议最佳的编解码技术。本文最后详细介绍了B/S视频会议所采用的架构和HTML5、JavaScript、CSS共三部分的代码设计,阐述了RTCMulticonnection模块和RecordRTC模块代码调用过程,成功实现了在局域网环境下的服务器配置和视频通信过程。实验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.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN948.63

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