Research And Design Of Videoconference System Based On Industrial And Commercial Network

With rapid development of network and multimedia communication technology, information construction of basic establishment has been being strengthened in the country. Traditional data operation interaction can't meet the requirement of network communication, so multimedia communication has become current hotspot of network programming. Current traditional connection-oriented conferencing has limitations of complex devices, hard connection, high spending bandwidth, so the system extension is a serious problem. Recent Desktop videoconference is a high efficient, low cost multimedia communication method of accomplishing two places or more meeting , which takes use of video technology and data communication technology and has advantages of low price, flexible configuration, convenient control and easy extension, so it is favored by many persons and enterprises. Currently many manufacturers are devoted to researching and developing such a system for the continually increasing market requirements. Hun Nan Industrial and Commercial System is speeding up to build computer network information construction, aiming to this point, we apply out desktop videoconference system researching project suit for Hun Nan Industrial and Commercial System.In paper, author earnestly analyses and researches corresponding standards of videoconference and the key technology of implementing multicast videoconference, including socket technology, ip multicast technology, audio & video coding technology and so on. On the base of analyzing desktop videoconference using socket technology, according to the current status of Hun Nan Industrial and Commercial Network System, author applies out a desktop videoconference system model connecting WAN and LAN; Through the analysis and research of proto type system, author designs a multi sockets, multi buffers scheme to realize real-time audio & video data collection, transmission; Uses key frame technology to accomplish a fast collection, high speed transmission and render of video, audio data system. And also gives arithmeticimprovements of real-time, stability, continuity video transmission, and the system has already got better performance.Author designs and implements the scheme of desktop videoconference system based on Hun Nan Industrial and Commercial Network, and also tests the feasibility of designed proto type. The system can resolve current need of Hun Nan Industrial and Commercial Network multimedia transmission and has better capability of upgrade and extension for the future continual increasing network requirements; The finished proto type system has characteristics as real-time audio multicasting and video multicasting and it can display multi-video and audio streams at the same time and requires low system resource requirements and has good performance of videoconference data collection, transmission and render.