说明：  简要介绍了基于TMS320DM642 的MPEG-4视频编解码器的硬件系统结构和软件任务流程 并重点阐述视频编解码模块在DM642平台上的移植和优化 实验结果表明 移植和优化后可以实现视频的实时处理 并能保持较高的图像质量和压缩效率
(Brief introduction of MPEG-4 based on the TMS320DM642 video codec hardware system architecture and software process and focuses on the task of video codec module in DM642 platform porting and optimizing the experimental results show that post-transplant and optimization can be achieved real-time video processing and able to maintain a high image quality and compression efficiency)