Abstract: Gives an implementation of H.264 video encoder in a video monitoring system based on PNX1500 DSP platform，and proposes a series of optimization solutions：Firstly，calculates half-pixel interpolation using the MBS hardware of PNX1500;Secondly on H.264 algorithm level，predigests motion estimation and brings forward skip mode decision for macroblocks;Thirdly on code level，improves coding speed by using custom operations and compilation optimization options.Simulation results show the optimized encoder can encode CIF-format video stream in real time.

摘要： 在基于PNX1500 DSP的视频监控系统中实现了H.264视频编码器，提出了一系列优化方案：利用PNX1500的MBS硬件处理能力计算半像素插值;在算法级简化了运动估计，提前判断宏块的跳过模式;在代码级，利用定制运算及编译优化选项，进一步提高了编码速度。测试结果表明，优化后的编码器可以实现对CIF格式视频流的实时编码。