Python上的OpenCV错误

如果我这样做，它将创建一个有效的AVI文件：

writer = cv.CreateVideoWriter(         filename=file,         fourcc=cv.CV_FOURCC('F', 'M', 'P', '4') ,         fps=iFps,         frame_size=(800,600),         is_color=1)cv.Writeframe(writer, cv.LoadImage(frames[i]))del writer # this makes a working AVI