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 npimport 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 objectfourcc = 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 =  30size = (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 finishedcapture.release()out.release()cv2.destroyAllWindows()