How to get the duration of video using cv2

Question

I can only get the number of frames CAP_PROP_FRAME_COUNT using CV2.

However, I cannot find the parameter to get the duration of the video using cv2.

Answer 1

First calculate frame per second like this

fps = cap.get(cv2.cv.CV_CAP_PROP_FPS)

Then duration can be calculated as (number of frames) / (frames per second)

 duration = float(num_frames) / float(fps) # in seconds