python 读取视频,处理后,实时计算帧数fps的方法

cap = cv2.VideoCapture("DJI_0008.MOV")
#cap = cv2.VideoCapture(0)
 
# Define the codec and create VideoWriter  
#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  
  rval,   = cap.read()
  # save a  
  if rval==True:
   #   = cv2.flip( ,0)
   	# Start time
    start = time.time()
    rclasses, rscores, rbboxes=process_image( ) #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  s per second
    fps = 1 / seconds;
    print( "Estimated  s per second : {0}".format(fps));
    #bboxes_draw_on_img( ,rclasses,rscores,rbboxes)
    #print(rclasses)
    out.write( )
    num=num+1
    print(num)
    #fps = cap.get(cv2.CAP_PROP_FPS)
    #print(" s per second using video.get(cv2.CAP_PROP_FPS) : {0}".format(fps)) 
  else:
    break
  # show a  
  cv2.imshow("capture",  )
  if cv2.waitKey(1) & 0xFF == ord('q'):
    break
cap.release()
out.release()
cv2.destroyAllWindows()