test cap

import cv2
cap = cv2.VideoCapture('/home/grad3/jalal/PycharmProjects/hw4_cs58‌​5/Concession_LAN_8‌​‌​00‌​k.mp4',cv2.CAP_FFMPEG)

if not cap.isOpened():
    print('not opened')

while True:
    ret,frame = cap.read()

    if ret == False:
        print('frame empty')
        break
    cv2.imshow('frame', frame)
    if cv2.waitKey(1) == ord('q'):
        break