Heterogeneous Dynamic Video Shifting for Video Conference System

• Main Authors: Ming-Hsien Hsu, 許明賢
• Other Authors: 吳明芳
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/41918482038723946533

碩士 === 崑山科技大學 === 電子工程研究所 === 100 === Videoconferencing system is based on technology of transmitting video and audio streams synchronously at different sites together for a meeting and is widely used in wired broadband network. With the great development of wireless mobile network (such as 3G, WiMAX, etc), mobile video conference would be increased in demand, therefore, how to achieve a world of heterogeneous networks with ubiquitous video conference has become a new trend in videoconferencing technology research and development. The current videoconferencing architecture is divided into client/server and peer-to-peer. In either architecture, the technologies would be used including coder and decoder of video and audio, network streaming, NAT traversal, and etc. In order to smoothly play video and audio streams, hardware capabilities also have to be considered in deep. The purpose of this plan is to develop a client / server architecture of videoconferencing technology to smoothly transmit and receive data with Google VP8 codec. By adding on adaptive profile (resolution, frame rate) technology in Google VP8 and using additional control channel to detect the network video transmission capabilities, videoconferencing system can be supported in cross-platform, and also can be transferred between different devices, which means without terminating the video conference, same video frames will be shifted from a device to another.