基于DirectShow实现局域网实时视频传输

随着计算机网络和多媒体技术的发展，音频、视频等多媒体信息已在网络中越来越普遍，它们深深地影响了人们的生活。MPEG-4是时下一种流行的视频编解码模式，怎样在Intemet上实时地传输MPEG-4码流已经成为当前的一个热点；同样是未来网络方向的一个研究重点。文中在目前的视频传输系统的基础上，利用新的协议标准和传输方式来实现视频的实时传输，使传输的视频实时，没有马赛克。论文研究了DirectShow技术，分析了其体系结构的特点与组成，研究了利用DirectShow实现视频采集、压缩编码、网络传输以及解码播放技术，并给出了利用RTP／RTCP以及DirectShow实现MPEG-4视频数据的实时直播的方法和部分核心代码，有效地保证了高质量的实时视频传输。同时在应用程序内开发源Filter，简化了开发流程和程序的调试。测试证明系统有良好的网络适应性，视频经过传输后比较流畅，几乎没有马赛克。

Realization of LAN Real-Time Video Transmission Based on DirectShow

With the development of computer network and multimedia technology, multimedia such as sound and video stream is becoming more and more popular in the Intemet, which changed people＇ s life greatly. MPEG-4 is used widely nowadays. How to transport real-time MPEG-4 data on the network is a hotspot, and also is very important in the future. Based on the above background, used new protocols and transmission to realize real-time video transmission. Researched DirectShow technology, analyzed the traits and organization of it＇s architecture and researched realizing video capture, encoding, real-time transmission, decoding and playback using Direct-Show. The methods and some core code of real-time video transmission of MPEG-4 using RTP/RTCP and Direct Show were given, which guaranteed the high quality of real-time video transmission. At the same time, some source filters were developed in the program, which simplified the development flow and the programming debugging. The testing results indicate that the system achieves good picture quality and fluency for MPEG-4 video under difficult network conditions.