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由于3G无线网络具有高丢包率、信道带宽有限且不稳定等特点,使用传统可靠的TCP协议传输视频,往会造成无线信道拥塞,出现画面延迟长、抖动严重等问题。而使用简洁、实时性更好的UDP协议传输视频,容易造成大量的数据丢失,大大降低视频的质量。针对上述出现的问题,提出了一种结合自适应的加权平均码率传输控制机制和基于TCP/UDP混合协议的视频帧分级传输模型的传输技术,使得视频传输的实时性和画面质量都能达到一个比较好的表现。
Due to the high packet loss rate and the limited and unstable channel bandwidth of 3G wireless networks, the use of the traditional reliable TCP protocol to transmit video will cause congestion of the wireless channel, resulting in long delay and jitter. The use of simple, real-time better UDP protocol video transmission, easily lead to a large number of data loss, greatly reducing the quality of the video. Aiming at the problems mentioned above, this paper proposes an adaptive weighted average bit rate transmission control mechanism and the transmission technology of video frame hierarchical transmission model based on the TCP / UDP hybrid protocol so that both the real-time video transmission and picture quality can be achieved A better performance.