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please never use the deprecated cv api, (it is already gone in opencv3) , but cv2 only

import numpy as np
import cv2

cv2.namedWindow("win")
camera = cv2.VideoCapture("my.mpg")
while camera.isOpened():
    ok, image=camera.read()
    if not ok:
        print "movie's over !"
        break
    cv2.imshow("win", image)
    k = cv2.waitKey(1) & 0xff
    if k == 27 : break # esc pressed

please never use the deprecated cv api, (it is already gone in opencv3) , but cv2 only

import numpy as np
import cv2

cv2.namedWindow("win")
camera = cv2.VideoCapture("my.mpg")
while camera.isOpened():
    ok, image=camera.read()
    if not ok:
        print "movie's over !"
        break
    cv2.imshow("win", image)
    k = cv2.waitKey(1) cv2.waitKey(20) & 0xff
    if k == 27 : break # esc pressed