Desktop Video Conferencing Systems, Depending On The Design And Implementation Of Real-time Audio Interaction

In recent years, with the rapid development of network technology, multimedia technology and communicating technology, the developing and applying of IP-based multimedia conferencing system becomes one of the hot spots of the present computer applications. The multimedia conferencing system is a system that individual and group in two or numerous different place be capable to use communicate network and multimedia devices to transmission the composite information, such as audio, video, file, and achieve the Real-time interacting for the conference.At first, this paper briefly introduces the developing process of the video conferencing system; emphasizes the structure and the key technique of video conferencing system and the requirements of the multimedia communication, then analyses the LAN-based multimedia communication standard H.323v2 and the protocols of the multimedia communication. On the base of deeply mastering H.323v2 standard, correlative communication protocols and communication mechanism, we present a blue print of the desktop video conferencing system and the scheme of compress and code the video and audio, and bring up the expanded UDP and the QoS based on the feedback. At last, we implement the video and audio interacting of the system using DirectShow and WinSock. According to the Analysis of the performance of the video and audio transport, the system has some practicality value, the technological parameter could satisfied the requirements of the real-time interaction of video and audio in the LAN.By the research of this task, we grasp the pivotal technology of the multimedia conferencing system, exploit an economical and efficient system, improve the capability of designing the multimedia communication system, ground a good base for the farther work.