Video On Demand System Based On Ip And Catv Network Integration Design And Implementation,

With the development of network and video technology, the achievements of video-on-demand (VOD) have been applied with its popularity due to IP network, and also have been widely used in many other fields such as distance-education, Tele-medicine, journalism, publishing, e-commerce, video conferencing, real-time monitoring and so on. Nowadays, it is gradually becoming a hotspot that how to realize the inter-network video application on the condition of the existing multi-networks.By analyzing the VOD application in IP network and CATV network respectively, aiming at the core problem of IP and CATV cross-network video application and integrating the existing achievements of other related fields, the author does a research on the following aspects including the system structure, transmit and control mechanism at broadcasting platform, processing mode at receiving terminal and serving platform. It is designed and realized a VOD system--DNDW VOD across dual-network of IP and CATV in this paper.The main work in this paper is summarized as follows:1. An architecture of the DNDW VOD system is designed. By using the architecture, transparent transmission and end-user transparent access can be realized in dual-network of IP and CATV. Furthermore, the system not only has the capability of supporting both the two-way interaction and the data broadcasting, but also satisfies the demands of the cosmically users and large information in VOD application.2. As to the paroxysmal and nonuniform characteristics of VOD, a transmission and control mechanism--differential parallel broadcasting is presented, which can improve the transmission efficiency and bandwidth utilization of the network. By integrating the mechanism with the COM module encapsulation technology at receiving terminal, the system will automatically switch transfer channels without any artificially interference.3. In order to solve the problem of losing frames during the video transmiting process, a forward error correction (FEC) solution of frames-oriented is presented. With this technology, we can improve the integrity probability of information receipt at one time, thus guarantee the real-time effectively during video playing.4. A DNDW VOD prototype is designed and realizeed. Based on the current IP and CATV network environment in China, the system can realize the inter-network application of VOD, which can support live broadcast, video download, broadcast online, random on-demand, and so on.All in all, the innovative technologies and methods showed in the dissertation will provide some useful reference for the related researchers. And the DNDW VOD system is an effective try to branch out into cross-network data services, based on the IP and CATV dual-network integration.