python opencv 批量将视频转化为图片

单个的视频转换图片参看：

对于多个视频，采用多线程处理方法

video_path为待转换视频的路径，pic_path为输出图像的路径，输出的图像统一保存在pic_path下面与相应视频名相同的文件夹下面。

代码如下：

# coding=utf-8
import cv2
import os
import threading
from threading import Lock, Thread

video_path = "./video/"
pic_path = "./pic/"
filelist = os.listdir(video_path)  


def video2pic(filename):
    # print(filename)
    cnt = 0
    dnt = 0
    if os.path.exists(pic_path + str(filename)):
        pass
    else:
        os.mkdir(pic_path + str(filename))
    cap = cv2.VideoCapture(video_path + str(filename))  # 读入视频
    while True:
        # get a frame
        ret, image = cap.read()
        if image is None:
            break
        # show a frame

        w = image.shape[1]
        h = image.shape[0]
        if (cnt % 20) == 0:
            cv2.imencode(.jpg, image)[1].tofile(pic_path + str(filename) + / + str(dnt) + .jpg)
            print(pic_path + str(filename) + / + str(dnt) + .jpg)
            dnt = dnt + 1
        cnt = cnt + 1
        if cv2.waitKey(1) & 0xFF == ord(q):
            break
    cap.release()


if __name__ == __main__:
    for filename in filelist:
        threading.Thread(target=video2pic, args=(filename, )).start()