基于流式传输的VOD教学系统传输策略及同步技术研究与实现

Research and Implementation of VOD Teaching System Transmission Strategies and Synchronization Technology based on Stream Transmission

流媒体VOD教学系统的开发同普通的视频点播系统一样,涉及到视频课件的压缩编码技术、课件传输控制技术、音视频的同步技术、VOD服务器集群策略、课件调度策略、缓冲区管理算法和数字版权管理技术等技术。但校园网络成分复杂,信息结构多样化导致其课件传输控制策略、同步技术比普通的视频点播系统更为复杂。提出了一种基于自适应传输的简单实用的VOD课件传输方案,并就音频流、讲义和演示流、教师的影像流及导航区四者的同步技术解决方法做了研究,给出了具体解决措施。实践证明上述方案措施得当,效果良好。最后给出整个系统的实现案例和性能指标。

As an ordinary video-on-demand system, development of stream media VOD teaching system involves video compression technology, courseware transmission control technology, synchronization of audio and video technology, VOD server clustering strategy, courseware scheduling strategy, buffer management algorithms and digital copyright management technology, etc. But complicated campus network and information structure lead to diversification of courseware transmission control strategy and synchronization technology to be complicated than the ordinary video-on-demand system. A simple and practical scheme based on the adaptive transmission of VOD courseware is given in the paper. And research on synchronization of audio streaming, lecture and demonstrationstreaming, teachers＇ video streaming and navigation area is discussed and the practical method is given. Results show that the effect is good. And example and specifications for the entire system are given.