How to get the duration of video using cv2
In OpenCV 3, the solution is:
import cv2
cap = cv2.VideoCapture("./video.mp4")
fps = cap.get(cv2.CAP_PROP_FPS) # OpenCV2 version 2 used "CV_CAP_PROP_FPS"
frame_count = int(cap.get(cv2.CAP_PROP_FRAME_COUNT))
duration = frame_count/fps
print('fps = ' + str(fps))
print('number of frames = ' + str(frame_count))
print('duration (S) = ' + str(duration))
minutes = int(duration/60)
seconds = duration%60
print('duration (M:S) = ' + str(minutes) + ':' + str(seconds))
cap.release()
cv2
is not designed to explore video metadata, so VideoCapture
doesn't have API to retrieve it directly.
You can instead "measure" the length of the stream: seek to the end, then get the timestamp:
>>> v=cv2.VideoCapture('sample.avi')
>>> v.set(cv2.CAP_PROP_POS_AVI_RATIO,1)
True
>>> v.get(cv2.CAP_PROP_POS_MSEC)
213400.0
Checking shows that this sets the point after the last frame (not before it), so the timestamp is indeed the exact total length of the stream:
>>> v.get(cv2.CAP_PROP_POS_FRAMES)
5335.0
>>>> v.get(cv2.CAP_PROP_FRAME_COUNT)
5335.0
>>> v.set(cv2.CAP_PROP_POS_AVI_RATIO,0)
>>> v.get(cv2.CAP_PROP_POS_FRAMES)
0.0 # the 1st frame is frame 0, not 1, so "5335" means after the last frame
Capture the video and output the duration is seconds
vidcapture = cv2.VideoCapture('myvideo.mp4')
fps = vidcapture.get(cv2.CAP_PROP_FPS)
totalNoFrames = vidcapture.get(cv2.CAP_PROP_FRAME_COUNT);
durationInSeconds = float(totalNoFrames) / float(fps)
print("durationInSeconds: ",durationInSeconds,"s")