The Research And Realization Of Video Conference Surveillance System Based On H.323 Protocol

With fast development of Internet, the video communications over networks rises rapidly. Though the video communications over networks become an important application in modern society, the management of it develops slowly. The criterion of the video communications over networks has to be strengthened.Most of the productions based on H.323 protocol in current market are terminals for two or more users in video conference, while the productions which can automatically recognize, analyze, deal with H.323 protocol and surveil information transmitted in the video conference lack. The thesis studies the problems mentioned above to meet the need of the network video surveillance and management.The main contribution of the thesis is as four aspects:Firstly, theory research. The types, frameworks and realization standards of video conference are studied first. Then the thesis studies the framework of H.323-based system and analyzes the protocol stack, mainly on the communication rules including calling process, logical channel management and media compress transmission. Finally the thesis studies the key technologies of the video conference system based on H.323 protocol, deeply studies several audio video coding standards and multimedia synchronization technologies. An automatically parsing mode for H.323 signaling and a video audio synchronization arithmetic are proposed.Secondly, design the surveillance system for video conference based on H.323. After analyzing H.323 video conference system, the thesis designs the architecture,main functions and the functions of each module for H.323 video conference system in detail.Thirdly, project realization. According to the design, the thesis uses key parameter to design the automatically parsing mode for H.323 signaling, uses advanced Winamp inset technology to design the mode for audio and video decoding, uses time sign to design the synchronization of audio and video arithmetic. The thesis designs and constructs the video conference surveillance system based on H.323 accordingly, and realizes automatic surveillance of the protocol signaling, getting video audio data automatically, distinguishing data types automatically and playing synchronously.Fourthly, test and verification. The thesis makes unit tests, integration tests and system tests, compares system function with the designed indexes, and verifies that the system function meets the need of design.By the study of the thesis, the need for H.323 network video conference surveillance is satisfied. The production has wide application future, which can provide reference for the surveillanee offuturemultimediaserv1eesinaeertainextent.