Streaming Media Technology And Its Application In The Online Teaching System

Streaming media technology adopts streaming transport method which means "playing while downloading". This makes not only startup delay time shorter, but also cache requirement less. What's more, it owns other characters such as synchronization, identity, and controllability. Because of all of the merits above, streaming media technology are widely used in internet multimedia news release, on-line broadcast, internet advertisement, electronic commercial, video-on-demand, distance medical, internet station, distance education and real time video meeting. Application system, international standard and fundamental research of streaming media are being focus of industry and scientific research institution recently. Therefore, it's significant to research on both theory and application of streaming media technology through designing an application system.In this thesis, the technology principles, broadcast methods, file format and key network protocols of streaming media are studied deeply. Through synthesizing and comparing the current main stream streaming media products, Windows Media Service technology is selected as the frame of E-learning system. Firstly, the whole design of E-learning system is described. Then, the application of streaming media in E-learning system is discussed in details. On the side of encoder, through analyzing, we present the solution that screen capture technology is selected as codec and push model is selected as streaming media transfer model. As to the player end, it is divided into three modules according to user and scene,which includes a real time learning module, a courseware ordering module and an educational evaluation module,they are designed respectively. Streaming media server is the most important part of streaming media system, we pay more attention to it's design. Through comparing the current several system solutions of the Streaming Media server, we select the cluster system solution to build our courseware stream media server. In our cluster stream media server, we join the server cluster technology and SAN technology together, and use the Network Load Balance (NLB) technology to balance the workload in the cluster, and use the Windows Media Technology to accomplish the stream media management.