Simple Webcam Video Streaming with FPS count using OpenCV Python 3

opencv_webcam.py

'''
Date: 07/09/2020
Written by Nandan M
'''

import cv2
import time

# 0 is default webcam. Change to switch between multiple cameras or IP address.
vc = cv2.VideoCapture(0) 

start_time = time.time()
# FPS update time in seconds
display_time = 2
fc = 0
FPS = 0

while True:

	_, frame = vc.read()

	# OpenCV reads images in BGR color format by default. 
	#frame_RGB = cv2.cvtColor(frame, cv2.COLOR_BGR2RGB)

	fc+=1
	TIME = time.time() - start_time

	if (TIME) >= display_time :
		FPS = fc / (TIME)
		fc = 0
		start_time = time.time()

	fps_disp = "FPS: "+str(FPS)[:5]
	
	# Add FPS count on frame
	image = cv2.putText(frame, fps_disp, (10, 25),
		cv2.FONT_HERSHEY_SIMPLEX, 0.7, (0, 255, 0), 2)

	# imshow converts BGR to RGB while saving or displaying.
	cv2.imshow('Video Stream w/ FPS', image)
	key = cv2.waitKey(1) & 0xFF

 	# press q to quit streaming
	if key == ord("q"):
		break

cv2.destroyAllWindows()