【作者】 唐成；

【导师】 贠卫国；

【作者基本信息】 西安建筑科技大学 ， 计算机应用， 2004， 硕士

【摘要】 MPEG-4视频传输是多媒体网络应用的重要课题，对它的研究有重大意义。论文采用MPEG-4编码技术，使用RTP／RTCP协议，设计了一个基于C／S(Client／Server)模型的网络视频实时传输结构，旨在适应目前网络状况，充分利用网络资源，在应用层获得最好的视频服务质量。 首先，论文讨论了HTTP、TCP等协议对实时传输的局限性，阐述了实时传输和控制协议RTP／RTCP。综述了MPEG-4标准的系统结构和MPEG-4视频编码技术。 其次，在视频数据的传输码率与网络带宽的适应性方面，作者通过分析适用于MPEG-4视频适应性编码的控制算法、视频数据打包算法和网络拥塞控制算法，提出了网络拥塞反馈控制算法的改进和优化思想。 最后，在前述对MPEG-4视频编码与传输的分析和设计基础上，作者采用Direct Show技术，给出了网络可视电话系统的可行性方案，对视频的实时采集、MPEG-4视频编码、视频传输和解码显示进行了编码测试；为使系统设计能够实用化，作者还设计了客户端与客户端、客户端与目录服务器的通讯数据结构，实现了对客户的网络管理。更多还原

【Abstract】 The MPEG-4 video streaming transport becomes an important topic on multimedia. It means significant to research. Using MPEG-4 codec technology and RTP/RTCP protocol, the paper gives a real-time video stream transport architecture over the Internet based C/S model, which aims at matching of the MPEG-4 video transport rate and bandwidth, at using the resource of Internet sufficiently and at archiving excellent video.Firstly, the paper discusses the limit of the HTTP/TCP. It describes the Real-time Transport Protocol and summarizes system architecture of MPEG-4, as well as encoding technology.Secondly, the author analyzes adaptive encoding control algorithm, pack algorithm and feedback congestion control algorithm suited to MPEG-4 video. Taking into account the matching transport rate and bandwidth, the author gives an improvement and optimization of the feedback congestion control algorithm.Finally, a feasible project of network visual telephone is designed. It depends on the analyzing of MPEG-4 encoding and transporting researched before, and on DirectShow technology. The components, such as the real-time sample, video encoding, video decoding and display, are programmed and tested. In order to application, the author presents a structure between clients and a structure between client and server, aimed to manage the action of clients.更多还原