Design And Implementation Of MPEG-4 Streaming Playing

With the rapid development of computer networks and multi-media technology, the VOD(Video On Demond) system, which is a combination of computer networks and multi-media technology, is used more and more widely. It also has extensive applications and a bright future. In the implementation of this kind of systems, it involves to encoding standards, transport control and so on, especially, the internet transport protocol and QoS(Quality of Service) of terminal are important parts of the VOD system. RTP(Real-time Transport Protocol) is adopted in network transfer of streaming media. RTP itself does not provide any mechanism to ensure delivery or provide other QoS guarantees, but relies on RTCP(Real-time Transport Control Protocol) to achieve these. RTCP can be used to monitor the state of data transferring, and provide the control of service quantity and session identification function. It is also used to do bandwidth control which is useful if there are many participants using the system. RTSP(Real-Time Streaming Protocol) provide the control of the session and user command to interact with the server. This paper is based on the characteristics of streaming transfer, combines with the correlative project, and finishes the MPEG-4 streaming playing software based on embedded Linux system: interacting control information through RTSP, adopting RTP/RTCP to achieve transport media data and quality feedback, the mechanism of multi-level buffer in terminal system achieves the QoS control. The system has a good result in practical application, and will be helpful for the future research.