Research And Design Of Realtime Stream Synchronization On Network Monitoring System

Now, with the development of security, the surveillance industry is playing a significant rolein kinds of areas, such as education, public security, and banking. At the same time, theaudio-video compression technology has become more sophisticated, it makes networkmonitoring become possible. With the development of3G in China and people’s live level, moreand more individual users are attractted by mobile network monitoring.Because of the advantageabout network monitoring, such as flexibility, easy to maintenance and use, network monitoringis leading the trends of future monitor market.In the network monitoring system, real-time streaming media transmission has been widelyused, and the audio-video synchronization is a key issue. By the impact of network latency,blocking, etc. There is labial asynchronization when receiving the data in the client, which willgreatly reduce the degree of the user experience. At present, the audio-video synchronizationalgorithm is diverse, complex and inefficient. But it is difficult to find a way for using in thenetwork monitoring system. Because sending the data need use RTP protocol, if we can use thetime information of the RTP packets effectively, audio-video synchronization issues will begreatly simplified. This article gives a solution about the audio-video synchronization issuesbased on network monitoring system platform. The entire network monitoring system includes amedia server, management server and client. Based on the transmission processing ofaudio-video streaming, it is divided into capture, sending, receiving, synchronization,decompression, and playback modules. With optimizing this modles, this article makes the fulluse of timestamp in the RTP protocol and proposes audio-video synchronization algorithm.This article firstly introduces the research background and significance of the audio-videosynchronization technology, such about the wide range of audio-video streaming applicationsand the value of the network monitoring system. Then, researching the related technology,including audio-video compression technology, streaming media technology, real-time transportprotocol RTP, and several audio-video synchronization technology. It analyzes the advantagesand disadvantages of synchronization technology, Then introduce network monitoring systemhardware and software environment, the characteristics of its software is based on Linuxoperating system and hardware feature is based on the ARM+DSP structure. By theory validationand simulation to find the best sent MTU value of the audio-video data and design cacheeliminates phenomenon of jitter and the out of order.finally, playbacking audio-videosynchronously in the PC, which on the framework of the direcshow.