【作者】 吴玥；

【导师】 尹青；

【作者基本信息】 解放军信息工程大学 ， 软件工程， 2008， 硕士

【摘要】 随着互联网高速发展,网络视频迅速兴起,已成为现代社会的一个重要应用,但对网络视频相关方面的监管没有跟上发展的步伐,必须对网络视频应用进一步规范。目前市场上开发的H.323产品主要为适用于通信双方或多方的视频会议终端产品,缺乏能够自动识别、分析、处理H.323协议,监控视频会议传输信息的产品。本文正是针对这一现状展开研究,以满足相关部门加强对网络视频监管的需要。本文主要针对四个方面进行了研究:第一,理论研究。首先,研究了视频会议系统的类型、结构组成及实现标准;其次,研究了H.323的体系结构,重点分析研究了包括呼叫接续、通道管理、媒体压缩传输等在内的通信规程;最后,研究了H.323视频会议系统的关键技术,对多种视音频编码标准以及音视频同步技术进行了深入研究;提出了H.323信令自动解析模式以及音视频同步算法。第二,基于H.323的视频会议监视系统方案设计。在分析研究H.323视频会议系统的基础上,对基于H.323的视频会议监视系统的总体架构、主要功能以及各子模块功能进行了详细设计。第三,方案实现。依据方案设计,利用H.323协议关键参数信息设计了H.323信令自动解析模式,采用先进的Winamp插件技术实现了音视频解码,利用时间标记设计了音视频同步算法,从而构建了基于H.323的视频会议监视系统,实现了自动监测协议信令、自动提取音视频数据、自动判别音视频数据类型及解码同步播放等功能。第四,系统测试验证。主要进行了单元测试、集成测试、系统测试,将系统功能与设计方案中的各项功能指标进行测试对比,验证了系统功能基本达到设计要求。通过本文的研究,基本可以满足对当前H.323网络视频会议的监视需要,具有广阔的应用前景,能够为将来的多媒体业务的监控研究提供一定的参考。更多还原

【Abstract】 With fast development of Internet, the video communications over networks rises rapidly. Though the video communications over networks become an important application in modern society, the management of it develops slowly. The criterion of the video communications over networks has to be strengthened.Most of the productions based on H.323 protocol in current market are terminals for two or more users in video conference, while the productions which can automatically recognize, analyze, deal with H.323 protocol and surveil information transmitted in the video conference lack. The thesis studies the problems mentioned above to meet the need of the network video surveillance and management.The main contribution of the thesis is as four aspects:Firstly, theory research. The types, frameworks and realization standards of video conference are studied first. Then the thesis studies the framework of H.323-based system and analyzes the protocol stack, mainly on the communication rules including calling process, logical channel management and media compress transmission. Finally the thesis studies the key technologies of the video conference system based on H.323 protocol, deeply studies several audio video coding standards and multimedia synchronization technologies. An automatically parsing mode for H.323 signaling and a video audio synchronization arithmetic are proposed.Secondly, design the surveillance system for video conference based on H.323. After analyzing H.323 video conference system, the thesis designs the architecture、main functions and the functions of each module for H.323 video conference system in detail.Thirdly, project realization. According to the design, the thesis uses key parameter to design the automatically parsing mode for H.323 signaling, uses advanced Winamp inset technology to design the mode for audio and video decoding, uses time sign to design the synchronization of audio and video arithmetic. The thesis designs and constructs the video conference surveillance system based on H.323 accordingly, and realizes automatic surveillance of the protocol signaling, getting video audio data automatically, distinguishing data types automatically and playing synchronously.Fourthly, test and verification. The thesis makes unit tests, integration tests and system tests, compares system function with the designed indexes, and verifies that the system function meets the need of design.By the study of the thesis, the need for H.323 network video conference surveillance is satisfied. The production has wide application future, which can provide reference for the surveillanee offuturemultimediaserv1eesinaeertainextent.更多还原