read.py

import cv2 
cap = cv2.VideoCapture()

# cap.open(2, apiPreference=cv2.CAP_V4L2)
cap.open(2)

cap.set(cv2.CAP_PROP_FOURCC, cv2.VideoWriter_fourcc('M', 'J', 'P', 'G'))
cap.set(cv2.CAP_PROP_FRAME_WIDTH, 1920)
cap.set(cv2.CAP_PROP_FRAME_HEIGHT, 1080)
cap.set(cv2.CAP_PROP_FPS, 30.0)

import time 
num_frame = 0
start = time.time()
while(True):
    ret, frame = cap.read()
    num_frame +=1
    if(num_frame%100==0):
        print('FPS: ', 100/(time.time()-start))
        start = time.time()
    cv2.imshow('Frame', frame)
    if cv2.waitKey(1) & 0xFF == ord('q'):
            break

# When everything done, release the capture
cap.release()
cv2.destroyAllWindows()