python+opencv分割图像每一帧并且生成文件夹存放

import cv2
import os
def save_img():
    video_path = 'D:\\Project\\CarDT_Data\\20210323_20_15'
    videos = os.listdir(video_path)
    for video_name in videos:
        file_name = video_name.split('.')[0]
        folder_name = video_path + file_name
        os.makedirs(folder_name, exist_ok=True)
        vc = cv2.VideoCapture(video_path+'/'+video_name) 
        c=0
        rval=vc.isOpened()

        while rval:  
            c = c + 1
            rval, frame = vc.read()
            pic_path = folder_name+'/'
            if rval:
                cv2.imwrite(pic_path + str(c) + '.png', frame)
                cv2.waitKey(1)
            else:
                break
        vc.release()
        print('save_success')
        print(folder_name)
save_img()