该文介绍了一种基于软件编/解码的数字视频实时传输系统的实现方法,能够在普通局域网环境中实现点到点的视频实时采集、编码、传输、解码和显示。该方法采用一种新的快速运动估计技术和改进的TM5位率控制算法以提高编码器的编码效率和编码图像质量,并通过选择合适网络协议和发送策略保证传输的可靠性。实验表明,所用方法不但能够保证图像传输质量,而且能够满足网络实时性的要求。 This paper introduces a method of real-time digital video transmission system based on software coding / decoding, which can realize point-to-point video real-time acquisition, encoding, transmission, decoding and display in the general LAN environment. This method uses a new fast motion estimation technique and an improved TM5 bit rate control algorithm to improve the coding efficiency and coding quality of the encoder and ensure the transmission reliability by selecting the appropriate network protocol and sending strategy. Experiments show that the proposed method can not only ensure the quality of image transmission, but also meet the requirements of network real-time.