Python: Extract 'n' frames in different length of video

Question

I want to extract constant number of frames 'n' from multiple length of video using Python and opencv. How to do that using opencv with Python?

e.g. in a 5second video, I want to extract 10 frames from this video evenly.

Answer 1

Code adopted from: How to turn a video into numpy array?

import numpy as np
import cv2

cap = cv2.VideoCapture('sample.mp4')
frameCount = 10
frameWidth = int(cap.get(cv2.CAP_PROP_FRAME_WIDTH))
frameHeight = int(cap.get(cv2.CAP_PROP_FRAME_HEIGHT))

buf = np.empty((frameCount, frameHeight, frameWidth, 3), np.dtype('uint8'))

fc = 0
ret = True

while (fc < frameCount  and ret):
    ret, buf[fc] = cap.read()
    fc += 1

cap.release()
print(buf.shape) # (10, 540, 960, 3)