Abstract: This paper analyzes the structure of video transmission over Internet, takes into account of behaviors of encoder, transmission channel and decoder synthetically, and proposes a new approach for optimal mode selection: global R-D optimized mode selection. Be different from local optimized of traditional R-D optimized mode selection, this new algorithm provides the best trade-off between compression efficiency and error resilience in global area, and makes the performance of system to be the best. The experiment results show that integrate with error control and concealment, the approach improves the robust of video data significantly and the video quality in decoder.

Key words: Video transmission, R-D optimized mode selection, Error control, Error concealment, RTP

摘要： 在分析网络视频传输结构的基础上，综合考虑了编码器端、传输信道以及解码器端的行为特征，提出了一种新的全局率失真最优化模式选择算法。有别于传统率失真优化算法的局部最优化，新的算法在全局范围内达到了编码效率和错误弹性的最佳折中，从而使得系统的整体性能达到最佳。实验表明，在与差错控制以及错误掩盖技术相结合后，新的算法大大提高了视频数据对传输错误的鲁棒性，提高了接收端的视频质量。

关键词: 视频传输, 率失真优化模式选择, 差错控制, 错误掩盖, RTP