视频逐帧读取并保存至指定文件夹（opencv之python描述）

import cv2
import os
import json


def get_frame(video_path):
    res = []
    for each in os.listdir(video_path):
        new_path = os.path.join(video_path, each)
        video = cv2.VideoCapture(new_path)
        img_path = './img' + '/' + str(each.split('.')[0])
        if not os.path.exists(img_path):
            os.mkdir(img_path)
        os.chdir(img_path) #改变当前工作目录至图片保存文件夹
        img_num = int(video.get(cv2.CAP_PROP_FRAME_COUNT))
        video_fps = video.get(cv2.CAP_PROP_FPS)
        video_size = (int(video.get(cv2.CAP_PROP_FRAME_WIDTH)),
                      int(video.get(cv2.CAP_PROP_FRAME_HEIGHT)))
        video_message = {'name': each, 'fps': video_fps, 'size': video_size, 'nums': img_num}
        res.append(video_message)
        for i in range(img_num):
            flag, frame = video.read()
            img_file = '0000' + str(i) + '.jpg'
            print(img_file)
            cv2.imencode('.jpg', frame)[1].tofile(img_file)
        video.release()
        os.chdir(os.path.dirname(os.path.abspath(__file__)))# 返回代码工作目录
    with open('data.json', 'w') as f:
        json.dump(res, f)


if __name__ == '__main__':
    videoPath = "./video"
    get_frame(videoPath)