OpenCV - extract 1st frame out of a video file

[kerzol81]

Hi All,

I'm trying to extract the first frame of a sample video file with OpenCV however it doesnt work:

import cv2

f = cv2.VideoCapture('1.mkv')

rval, frame = f.read()
cv2.imwrite('first_frame.jpg', frame)
f.release()

Could you help me out, what do I do wrong, the jpeg file is empty after running the code

Thanks

Zoli