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import cv2 cap = cv2.VideoCapture('m.avi') print cap.grab() this code always returns FALSE wheras when opening a video 'b.avi' which was captured by webcam using opencv it returns TRUE

import cv2 cap = cv2.VideoCapture('m.avi') print cap.grab()

this code always returns a False value but when opening the video file which was captured by the webcam using opencv code, it returns True

 import cv2
cap = cv2.VideoCapture("m.avi")
while(cap.isOpened()):
    ret, frame = cap.read()
    print cap.grab()
    cv2.imshow('frame',frame)
    if cv2.waitKey(1) & 0xFF == ord('q'):
        break

cap.release()
cv2.destroyAllWindows()