Research Of Key Technology And Implementation Of VOD System Based On MPEG-4/DVB

With the development of multimedia and network communication technologies, the bandwidth efficiency is widely improved, and this is propitious to develop the VOD service on DVB broadcasting network. It must resolve protocol of service and VCR strategy to improve server efficiency and consumer QOS.VOD system ability lies on Network bandwidth and server efficiency mostly, effective bandwidth-sharing protocol can improve the service ability and QOS of VOD system with limited system resource significantly. On the base of Staggered and Fast protocols, a new protocol is proposed, named as Fast Staggered Broadcasting protocol (FSB). The analytic results have shown that the FSB protocol outperforms other existing strategies on the current conditions. One enhanced protocol is proposed based on FSB-Dynamic FSB Protocol, and it is applicable to play live broadcasting. VCR is the importance standard of QOS in VOD system, and consumers can be satisfied to provide the VCR function. Paper studies a few common VCR strategies.Providing VOD service on DVB network has attracted large numbers of service providers and consumers. What we have done and what we will do next will advance the VOD application, and provide a good theoretical and practical foundation for VOD research based on MPEG-4/DVB.