python 读取视频,处理后,实时计算帧数fps的方法

实时计算每秒的帧数

cap = cv2.VideoCapture("DJI_0008.MOV")#cap = cv2.VideoCapture(0) # Define the codec and create VideoWriter object#fourcc = cv2.cv.FOURCC(*'XVID')fourcc = cv2.VideoWriter_fourcc(*'XVID') out = cv2.VideoWriter('output1.avi', fourcc, 20, (1920, 1080)) num=0 while cap.isOpened():  # get a frame  rval, frame = cap.read()  # save a frame  if rval==True:   # frame = cv2.flip(frame,0)   	# Start time    start = time.time()    rclasses, rscores, rbboxes=process_image(frame) #换成自己调用的函数    # End time    end = time.time()  	# Time elapsed    seconds = end - start    print( "Time taken : {0} seconds".format(seconds))  	# Calculate frames per second    fps = 1 / seconds;    print( "Estimated frames per second : {0}".format(fps));    #bboxes_draw_on_img(frame,rclasses,rscores,rbboxes)    #print(rclasses)    out.write(frame)    num=num+1    print(num)    #fps = cap.get(cv2.CAP_PROP_FPS)    #print("Frames per second using video.get(cv2.CAP_PROP_FPS) : {0}".format(fps))   else:    break  # show a frame  cv2.imshow("capture", frame)  if cv2.waitKey(1) & 0xFF == ord('q'):    breakcap.release()out.release()cv2.destroyAllWindows()

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