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Hi all! I need your help regarding the following code. My goal is to read and show the video with a resolution modification.

import cv2
 
cap = cv2.VideoCapture("C:/Users/user/Desktop/Foot_Detection/ball_tracking_example.mp4")
 
def rescale_frame(frame, percent=30):
    width = int(frame.shape[1] * percent/ 100)
    height = int(frame.shape[0] * percent/ 100)
    dim = (width, height)
    return cv2.resize(frame, dim, interpolation =cv2.INTER_AREA)
 
if (cap.isOpened() == False):
    print("Error opening video stream or file")
 
while (cap.isOpened()):
    # Capture frame-by-frame
    ret, frame = cap.read()
 
frame = rescale_frame(frame, percent=30)
    if ret == True:
 
cv2.imshow('Frame', frame)
 
if cv2.waitKey(25) & 0xFF == ord('q'):
            break
 
else:
        break
 
cap.release()
 
cv2.destroyAllWindows()
 

After executing the above code, the video displayed on my screen till the end. However, I have got the following error:

Traceback (most recent call last):
  File "C:/Users/user/Desktop/Foot_Detection/FootDetection.py", line 24, in <module>
    frame = rescale_frame(frame, percent=30)
  File "C:/Users/user/Desktop/Foot_Detection/FootDetection.py", line 10, in rescale_frame
    width = int(frame.shape[1] * percent/ 100)
AttributeError: 'NoneType' object has no attribute 'shape'
 

I tried to install the codec for mp4 and to the video path is correct. Could you please assist me in this matter? Thank you in advance.