中文说明：应用背景提取视频文件中所有帧图像，视频格式为.avi，这段代码可以选择一个或多个视频，根据视频名称和帧的序号对图片命名。设定的只能选择avi格式，至于其它格式的视频你可以改改代码的第一句试试看。关键技术获取视频长度，将每一帧图像保存到磁盘中。
English Description：
Application backgroundExtract all the video files in the image, video format is.Avi, this code can choose one or more video, according to the video name and frame number of the image. The set can only choose avi format, as for other video formats you can change the code of the first sentence have a try.Key TechnologyGet the video length, save each frame image to disk.