opencv学习27——从视频文件获取图像

import cv2

cap = cv2.VideoCapture("video01.avi")              # 获取视频对象
isOpened = cap.isOpened                             # 判断是否打开
# 视频信息获取
fps = cap.get(cv2.CAP_PROP_FPS)
width = int(cap.get(cv2.CAP_PROP_FRAME_WIDTH))
height = int(cap.get(cv2.CAP_PROP_FRAME_HEIGHT))

imageNum = 0
while(isOpened):
    if imageNum/fps == 2:                         # 获取两秒内视频图片
        break
    else:
        imageNum = imageNum + 1

    (frameState, frame) = cap.read()                # 记录每帧及获取状态
    fileName = 'image' + str(imageNum) + '.jpg'   # 存储路径

    if frameState == True:
        cv2.imwrite(fileName,frame,[cv2.IMWRITE_JPEG_QUALITY,100])
        print(fileName+"successfully write in") # 输出存储状态
print('finish!')