一个视频帧的抓取演示程序。开发平台：Windows XP, Visual C++ 6.0。该程序首先打开mpg文件，然后抓取视频文件的首帧并存为bmp文件。-a video frame grabbing demonstration program. Platform : Windows XP, Visual C 6.0. The procedure was first opened mpg file, and then crawls video files of the first frame