Research Of Key Technology In VOD System

Recently, with the significant development of the Internet technology, a profound melioration come true on broad band based facilities construction and with increasing number of internet users, the implication and development of Network Streaming Media technology has become more available. Moreover, a newly MPEG-4 has become mature and a necessary basic standard for the implication of streaming media. VOD system(Video on Demand System),which is a representative application of video and audio media transmission, has been paid more and more attention.VOD technology is a blending result of multiple subjects and fields such as computer technology, network communication, multimedia technology and digital compression. VOD system is an alternating video-ordering system. Users can choose watching and control the playback process on their will, which radically overcome the shortages of passive way on and completely implement the users' initiative of getting information. It is also a very important and difficult subject. Now, the coming forth of some new methods of video encoding and standards of video transmission continuously promotes the development of VOD technology, and brings the voice of the generalization of its application. Therefore, the research on the subject takes on very important practical worth.The concept and the structure of a VOD system are first introduced in this paper, and then the current status and future development about it are described. Further more, the paper designs the function modules in the network transmission of VOD system, and present a new server response mechanism. Through the reading of a great deal of the domestic and oversea literature of VOD technology, we introduce and analyze the technology of video and audio encoding, the technology of video/audio transmission and some protocols related.