摄像头脸部识别 （1）opencv 抓取视频数据并保存

基于python 和 opencv 3.4.0 （兼容 opencv 2.X 参考注释），详细如代码

import numpy as np

import cv2

# 从文件打开视频

#videoFile = "test.mp4"

#capture = cv2.VideoCapture(videoFile)

#从摄像头获取视频

capture = cv2.VideoCapture(0)

# Define the codec and create VideoWriter object

fourcc = cv2.VideoWriter_fourcc(*'XVID')

#opcv3.x

#从视频文件打开可以获取fps

#fps = capture.get(cv2.CAP_PROP_FPS)

fps =  30

size = (int(capture.get(cv2.CAP_PROP_FRAME_WIDTH)),

        int(capture.get(cv2.CAP_PROP_FRAME_HEIGHT)))

#opencv2.x

#fps = capture.get(cv2.cv.CV_CAP_PROP_FPS)

#size = (int(capture.get(cv2.cv.CV_CAP_PROP_FRAME_WIDTH)),

#        int(capture.get(cv2.cv.CV_CAP_PROP_FRAME_HEIGHT)))

out = cv2.VideoWriter('output.avi',fourcc, fps, size)

print("Video size:",size)

imageindex = 0;

while(capture.isOpened()):

    ret, frame = capture.read()

    if ret==True:

        out.write(frame)

        cv2.imshow('frame',frame)

        cv2.imwrite('image%s.jpg'%(str(imageindex)),frame)

        imageindex +=1

        if cv2.waitKey(1) & 0xFF == ord('q'):

            break

    else:

        print("Read video frame failed!")

        break

# Release everything if job is finished

capture.release()

out.release()

cv2.destroyAllWindows()