Based On Non-real-time Streaming Technology Teaching Vod System Key Technology Research And System Development

Stream medium VOD teaching is able to satisfy continuation medium real time nature and height handling capacity request, transmission problem catch with a net going ahead in low bandwidth of middle having resolved the multi-media information resources taking video frequency, VF information as representative, the initiative having strengthened a learner composes in reply video frequency, VF resource's but under the control of, studying having satisfied a learner much better needs. VOD network teaching already becomes the popular teaching of modern education pattern.The thesis studies the stream medium key technology and applies to being not that real time teaching system hits the target mainly. The thesis complies with stream medium basal principle first starting, medium compression form (JPEG series standard), Microsoft stream style medium form (ASF) having introduced the stream medium relevance form, if common etc. Comply with bprobe improving an algorithm and going after the tail algorithm drawing inspiration from together the union stream medium network transmission characteristic and then, the agreement (RTSP) having introduced the real time transmission agreement (RTP) and the real time fluidization detailedly, concentrate on having studied one kind of RTP/RTCP-based bandwidth self fit in with transfers tactics in school VOD net.The thesis core is the technology studying the stream medium teaching system tone video frequency server. Come to a conclusion by the fact that the mathematics being in progress to the server builds model analysis: Adopt the high-capacity dibble seeding server associate to be the key improving dibble seeding system service quality,and Designed the model of the VOD server. The thesis returns the synchro problem back to the medium teaching system alto voice and video frequency having studied a stream. Feasible tone video frequency synchronism also passes method sigmatism such as time stamp, buffer area so that can fairly good solving.In the field of controller algorithm finally, flow to combine algorithmic cause by the fact that comparative analysis knows the patch stream controller algorithm function is better than managing other owing to bulk, this algorithm has made use of patch tactics characteristic, can gain the much better function thereby. And the improved flow scheduling algorithm patch transplanted to the campus VOD Teaching System.