Design And Implementation Of High-Definition Video Conference Platform

With the enhancement of network bandwidth and video technology, the visual effect of video conferencing has been getting better and better, the current video conferencing systems are mainly three types, the first one price is very high, and mainly consist of large MCU hardware components, usually used in large scale system; the second one is cheaper than the first one and usually used in medium-sized conference system and consist of a small MCU and its software system; the third one is relatively low price, using pure software-wise and generally used for small meetings. In this paper, considering the last two scenarios,the author had accomplished design and implementation of a conference control software platform which can access media processor hardware and software media processor. The system designed in this paper is highly flexible, scalable, and able to adapt to different applications occasions.The video conference platform successfully realized conference establishment and management and held a media processor access functions and uses MediaStreamer2streaming engine as a client, using hardware media processor to achieve a high-definition video conferencing capabilities. In this paper, the author mainly completed the design of conference platform and the development of the key modules, and study the use of MediaStreamer2and the media server to achieve HD video calls. Conference platform uses SIP as conference session protocol,and achieve SIP communications based on SSAPI functions. The conference management and conference control functions are designed and implemented base on HTTP protocol that make any SIP terminal can access the conference platform without achieving the conference control feature. Using XML-RPC remote call control protocol to accomplish the management of media server and the multimedia processing. In order to achieve HD video calls, this article study the implementation of X264encoder on MediaStreamer2, analysis H.264on the RTP real time streaming media technology, and finally improve the clarity of the video call and reduce the video latency.The system coupling degree is low, the deployment is simple, and can be used in poor network conditions. System test results show that it can achieve4-channel720P video input and1-channel720P video output conference in good network condition and each video real-time rate is between1-2Mbps. when hold low definition video conferencing, system can achieve up to16-channel CIF video stream. The system is stable with abundant functions, and can be better used in a small video conference. Therefore, the implementation of platform has important practical application value.