How to know total number of Frame in a file with cv2 in python
With a newer OpenCV version (I use 3.1.0) it works like this:
import cv2cap = cv2.VideoCapture("video.mp4")length = int(cap.get(cv2.CAP_PROP_FRAME_COUNT))print( length )And similar for other video properties cv2.CAP_PROP_*
import cv2cap = cv2.VideoCapture(fn)if not cap.isOpened(): print "could not open :",fn returnlength = int(cap.get(cv2.cv.CV_CAP_PROP_FRAME_COUNT))width = int(cap.get(cv2.cv.CV_CAP_PROP_FRAME_WIDTH))height = int(cap.get(cv2.cv.CV_CAP_PROP_FRAME_HEIGHT))fps = cap.get(cv2.cv.CV_CAP_PROP_FPS)see here for more info.
also, all of it with a grain of salt, not all those props are mandatory, some might not be available with your capture / video codec
Here is how it works with Python 3.6.5 (on Anaconda) and OpenCV 3.4.2.[Note]: You need to drop the "CV_" from the "CV_CAP_PROP_xx" for any property as given on the official OpenCV website.
import cv2cap = cv2.VideoCapture("video.mp4")property_id = int(cv2.CAP_PROP_FRAME_COUNT) length = int(cv2.VideoCapture.get(cap, property_id))print( length )