learnopencv/FPS/frame_rate.py

#!/usr/bin/env python

import cv2
import time

if __name__ == '__main__' :

    # Start default camera
    video = cv2.VideoCapture(0);
    
    # Find OpenCV version
    (major_ver, minor_ver, subminor_ver) = (cv2.__version__).split('.')
    
    # With webcam get(CV_CAP_PROP_FPS) does not work.
    # Let's see for ourselves.
    
    if int(major_ver)  < 3 :
        fps = video.get(cv2.cv.CV_CAP_PROP_FPS)
        print "Frames per second using video.get(cv2.cv.CV_CAP_PROP_FPS): {0}".format(fps)
    else :
        fps = video.get(cv2.CAP_PROP_FPS)
        print "Frames per second using video.get(cv2.CAP_PROP_FPS) : {0}".format(fps)
    

    # Number of frames to capture
    num_frames = 120;
    
    
    print "Capturing {0} frames".format(num_frames)

    # Start time
    start = time.time()
    
    # Grab a few frames
    for i in xrange(0, num_frames) :
        ret, frame = video.read()

    
    # End time
    end = time.time()

    # Time elapsed
    seconds = end - start
    print "Time taken : {0} seconds".format(seconds)

    # Calculate frames per second
    fps  = num_frames / seconds;
    print "Estimated frames per second : {0}".format(fps);

    # Release video
    video.release()