Python OpenCV video.get(cv2.CAP_PROP_FPS) returns 0.0 FPS

Question

This is my video

This is the script to find fps:

import cv2
if __name__ == '__main__' :

    video = cv2.VideoCapture("test.mp4");

    # Find OpenCV version
    (major_ver, minor_ver, subminor_ver) = (cv2.__version__).split('.')

    if int(major_ver)  < 3 :
        fps = video.get(cv2.cv.CV_CAP_PROP_FPS)
        print "Frames per second using video.get(cv2.cv.CV_CAP_PROP_FPS): {0}".format(fps)
    else :
        fps = video.get(cv2.CAP_PROP_FPS)
        print "Frames per second using video.get(cv2.CAP_PROP_FPS) : {0}".format(fps)

    video.release();

This is the output of the script for this video: Frames per second using video.get(cv2.CAP_PROP_FPS) : 0.0

Why is it returning 0.0? The FPS is 14.0

did you check opencv actually opened the file? (with `video.isOpened()`) — api55, Feb 28 '18 at 09:26
@api55 you are right it didn't, it returns `False`. Why is that? — Tasos, Feb 28 '18 at 09:47
well, it didn't open it, you can try with `video.open("test.mp4")` try, to put the full path just in case... if not try another video (to discard a codec problem) — api55, Feb 28 '18 at 10:24
It was actually because opencv was not installed via pip (I have no idea how it was being importing, it's my first time using it). So after doing `pip-install python-opencv`, it worked like a charm. — Tasos, Feb 28 '18 at 10:28
That just explains what was the problem in the first place, when you install opencv with pip it brings its own backends (ffmpeg) so I think the problem was that your first opencv backend was broken — LichKing, Jan 09 '19 at 13:09

score 12 · Accepted Answer · edited Nov 18 '22 at 15:10

12

Performing pip install python-opencv fixed the problem and the FPS is correctly detected.

EDIT: tested with python 3.8 and indeed it is pip install opencv-python. Cannot remember two years ago what python I was using.

EDIT November 2022: please also check Perry's answer below, if you are using a newer opencv-python version

edited Nov 18 '22 at 15:10

Perry

264
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16

answered Feb 28 '18 at 10:29

Tasos

1,575
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2

When I try this on Windows 10, I get three rows of output: `Collecting python-opencv`, `ERROR: Could not find a version that satisfies the requirement python-opencv (from versions: none)` and `ERROR: No matching distribution found for python-opencv` – HelloGoodbye Aug 12 '19 at 09:53
2

Actually it should be `pip install opencv-python` – decadenza Mar 26 '20 at 16:11
2

On a Google Colab Notebook, I had to use `pip install --upgrade --force-reinstall opencv-python` – Tomasz Zielański Jan 03 '22 at 12:10

score 6 · Answer 2 · answered Nov 17 '22 at 12:40

The recent versions of opencv-python will give an error called AttributeError because cv2 doesn't have any attribute named cv.

Instead use the following

import cv2

vidcap = cv2.VideoCapture('some_video.avi')
fps = vidcap.get(cv2.CAP_PROP_FPS)

print(f"{fps} frames per second")

This will give the frames per second value

Python OpenCV video.get(cv2.CAP_PROP_FPS) returns 0.0 FPS

2 Answers2

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