[Python] read all mp4 files in the folder

I want to read all mp4 files in the folder but when running it doesn't work, I want to read file 1.mp4 when it finishes running it automatically runs 2.mp4 .... n.mp4.

import os
import cv2
import numpy as np
for root, dirs, files in os.walk('f:\\a'):
for file in files:
tt = (os.path.join(root,file))
print(tt)
cap = cv2.VideoCapture(tt)

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


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

cap.release()
cv2.destroyAllWindows()



I have put in a loop (for) but it only shows a list of files (cv2.imshow('frame', frame), please guide me.

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