说明：  改程序将avi格式的视频转换成图片序列，avi视频要求是无压缩的，保存的图片支持多种格式，如JPG，bmp，tif等，图片命名按照生成的顺序数字命名。
(Reform program will convert avi format video picture sequence, avi uncompressed video requirement is to save the image to support a variety of formats, such as JPG, bmp, tif, etc., digitally generated image named in the order named.)