The Streaming Media Technology In Distance Education

This paper explores the integrtion of the Windows Media technologies into a virtual classroom environment.A set of authoring tools that is suitable for web-baseed presentation has been developed on the platform of Microsoft Windows Media Service 4.0.Both live streaming and on-demand media productions are supported. For live streaming, a model is presented to implement virtual classrooms presentation of audio and web-based text/graphics material. The student may through the electron "the hypothesized dialogue" in the discussion curriculum question, simultaneously the internet visitor also be possible to invite to join " the classroom discussion".Therefore may say the multimedia courseware manufacture level the height is the distance learning system whether succeeds key.Pulls closer people's distance using the modern communication technology,provides the brand-new study way with the advanced multimedia technology for the student,learns more richer contents in the shortest time, this is precisely the distance learning goal is at.May see it from the distance learning definition to have the following three aspect connotation:Student and teacher's separation, student and student's separation , use communication media and transmission system organization teaching.Simultaneously also may use the existing network condition establishment hypothesized class and grade, strengthens between student's exchange.The learner may the time which facilitates in oneself, the suitable place,the speed and the way which needs according to oneself, utilizes the richer teaching resources to carry on the study.When the audio frequency,the video frequency flow the information the transmission , the long downloading time to the average consumer is unendurable.Because of this,at present on the net program usually all is the very short fragment, not impossible to continue the very long time.The Media Service appearance caused this kind of situation to have the very big change.Media Service uses the advanced class technology solved has flowed the information on Internet and the Intranet transmission question.Each part of the paper is expatiated to three models. These are: 1.at workstation side,a user-friendly application was designed to implement real-time media contents play-list control , while another was desighed for lecturers to give presentations. 2. Server-side switching is used to send stream; 3. student side: real-time receiving.The system work process is as follows:The input video frequency and the tonic train signaling will give MPEG4 the encoder to carry on the code, the program which the encoder will output flow already may store the storage device also to be possible directly to give Media Server, Media Server the main function complete broadcasting which the program will flow.Media Server broadcast the program has three origins, it possibly is the preservation in the storage device ASF document,also may be the program which Encoder real-time transmits, it broadcast the program also may gain from other Media Server. Moreover,scripting command technology is explored to improve the interactivity between the lecturer and the media contonts. With a specially desighed web pages, the Internet clients can view auto-refreshed slides and lecture audio,and interaction with Java Applets runnung on the web page. By using such kind of DHTML web pages,answering online or offline is surported.