Research And Implementation Of Multi-point Video Conference System Software Based On IP Multicast

Some questions of video conferencing system are discussed and researched in this paper, such as different sorts, protocol, standard and structure of system. H.323 protocol of ITU-T is introduced particularly including the details of its content and organization which is instituted for IP network. It is analyzed and discussed in detail how to design and realize the video conferencing system software based on IP network.A video conferencing system based on the strcture of C/S modle is designed in the paper. The main function and characteristics of MCU is introduced which is very important and necessary. It analyzes the central management server and designs that it is how to control the whole system and manage the progress of conferencing. In the system the capturing, compressing and playing video and audio information are done by DirectShow technology which is based on COM groupware. Coder and decoder of H.264 which is a sort of very popular technology for the compression of video signal is used in this system in order to get good effect of video compression. Using H.264 standard can effectively improve compression ratio and transmitting speed compared with H.263 and MPEG-4 standard.It is discussed that IP multicast technology and WinSock sockets technology.How to improve the security of the video conferencing system is discussed. This video conferencing system has many characteristics such as simple structure, perfect function, easy to upgrade, etc.