opencv读取视频 opencv读取视频并保存图像的方法

import cv2
import os

video_path = './未戴安全帽视频01/'
image_path = './images/'

video_files = [i for i in os.listdir(video_path) if i.split('.')[-1] in ['mp4']]
len(video_files)

#　video_file:'./未戴安全帽视频01/中建四局-东围墙5_001_2021-03-22-18-04-28_2021-03-22-18-04-33.mp4', 
# pic_dir:'中建四局-东围墙5_001_2021-03-22-18-04-28_2021-03-22-18-04-33'
def get_image(video_file, pic_dir):
    if not os.path.exists(pic_dir):
        os.makedirs(pic_dir)
    
    # cv2读取视频文件
    vc = cv2.VideoCapture(video_file)
    index = 0
    # 判断载入的视频是否可以打开
    rval = vc.isOpened()
    while rval:  # 循环读取视频帧
        index = index + 1
        
        rval, frame = vc.read()
        # 每十帧保存一张图片
        if index * 10 % 1 == 0:
            if rval:
                # cv2.imshow("capture", frame)
                save_file = pic_dir + str(index).zfill(5) + '.png'
                cv2.imwrite(save_file, frame)  # 存储为图像，保存名为文件夹名
                cv2.waitKey(1)
            else:
                break
        vc.release()
    print("已保存%d" %(index - 1) + "张图片")
        
# video_file = './未戴安全帽视频01/01.mp4'
# pic_path = '01/'
# get_image(video_file, image_path + pic_path)

for file in video_files:
    video_file = video_path + file
    pic_path = image_path + file.replace('.mp4', '/')
    get_image(video_file, pic_path)

import cv2
import os


def save_img():
    video_path = r'F:\test\3.10'
    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)
        print(video_path + '/' + video_name)
        vc = cv2.VideoCapture(video_path + '/' + video_name)
        # 读入视频文件
        c = 0
        rval = vc.isOpened()

        while rval:  # 循环读取视频帧
            c = c + 1

            rval, frame = vc.read()
            if c%10 ==0:
                pic_path = folder_name + '/'
                if rval:
                    cv2.imwrite(pic_path + str(c) + '.png', frame)  # 存储为图像，保存名为文件夹名
                    cv2.waitKey(1)
                else:
                    break
        vc.release()
        print('save_success')
        print(folder_name)


save_img()

if not os.path.exists(path):
    os.makedirs(path)