The Design And Realization Of Network Monitoring System Based On Streaming Media

According to the needs and characteristics of audio-video real-time monitoring system, we choose the real-time transmission and control protocol(RTP/RTCP) which suits this system in this paper. We choose the developing platform, DirectShow as well, analyze this platform in detail, and give an elaborate introduction on the design and realization of the monitoring system.First of all, in this paper we put forward some key ideas about system design and the resolving strategies on some systematic problems, based on the characteristics of streaming media and the needs of system. Secondly, considering the actual situation, we provide the overall graph of system design. We elaborate on the developing process which is in charge of network sending and receiving in detail. We encapsulate the network sending and receiving, realize the audio-video synchronism in this process. Because the congestion of network makes a great effect on the streaming media system, we analyze the problems, the congestion of network and bandwidth self-adaptation particularly; send control information by RTCP; analyze the information from these two aspects, pack loss and end to end delay; and finish the program finally. In the end, we set up the filter graph and perfect this system. By the above-mentioned steps, we resolve the audio-video synchronism satisfactorily. At the same time, we settle the congestion of network and bandwidth self-adaptation by adjusting coding ratio of the sending end and choosing key frame.