opencv: OpenCV 4.4.0 macOS Catalina "segmentation fault"

PIP opencv-python package issue: https://github.com/skvark/opencv-python/issues/376

System information (version)

OpenCV => ❔
Operating System / Platform => ❔
Compiler => ❔

Model Name: MacBook Air Model Identifier: MacBookAir7,2 Processor Name: Dual-Core Intel Core i5 Processor Speed: 1.8 GHz Number of Processors: 1 Total Number of Cores: 2 L2 Cache (per Core): 256 KB L3 Cache: 3 MB Hyper-Threading Technology: Enabled Memory: 8 GB

python --version Python 3.8.5 [3.7,3.6]

❯ pip --version pip 20.2.2 from /Users/xxx/.pyenv/versions/3.8.5/envs/AI-3.8.5/lib/python3.8/site-packages/pip (python 3.8)

Python 3.8.5 (default, Aug 12 2020, 19:20:20) [Clang 11.0.3 (clang-1103.0.32.62)] on darwin Type “help”, “copyright”, “credits” or “license” for more information.

import cv2 cv2.version ‘4.4.0’

Detailed description

Got "[1] 26545 segmentation fault " While running the official OpenCV documentation tutorial code from https://opencv-python-tutroals.readthedocs.io/en/latest/py_tutorials/py_gui/py_video_display/py_video_display.html

Tested Code:

import numpy as np
import cv2

cap = cv2.VideoCapture(0)

while(True):
    # Capture frame-by-frame
    ret, frame = cap.read()

    # Our operations on the frame come here
    gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)

    # Display the resulting frame
    cv2.imshow('frame',gray)
    if cv2.waitKey(1) & 0xFF == ord('q'):
        break

# When everything done, release the capture
cap.release()
cv2.destroyAllWindows()

Error message: “”" python test.py [1] 60134 segmentation fault python test.py

╭─ ~/Projects/cv2 ✘ SEGV  AI-3.8.5 3.8.5 21:39:57 “”"

What I’ve. tried :

Used different terminals to run the code. (system terminal app, JetBrains PyCharm terminal, viscose terminal, iterm2, iterm2 is setup for camera access )
Used different Python versions (3.6,3.7,3.8)
Tried to build from source code. (same problem)

Steps to reproduce

Issue submission checklist

I report the issue, it’s not a question
I checked the problem with documentation, FAQ, open issues, answers.opencv.org, Stack Overflow, etc and have not found solution
I updated to latest OpenCV version and the issue is still there
There is reproducer code and related data files: videos, images, onnx, etc

About this issue

Original URL
State: closed
Created 4 years ago
Comments: 24 (11 by maintainers)

Links to this issue

python 3.x - segmentation fault in imshow in opencv python3 - Stack Overflow

Most upvoted comments

opencv-python version 4.5.4.58 still presents this very same issue on Manjaro Linux as of november 2021. After having dowgraded to opencv-python 4.5.3.56 the issue is resolved

magiwanders on Nov 3, 2021

UPDATE: (temp fix)

Just checked the previous versions. The issue persists on 4.3.0.38, but not on ‘4.3.0.36’. So whatever is causing it, started on that version.

I guess I continue using ‘4.3.0.36’ for now…

mhmxd on Aug 13, 2020

opencv-python version 4.5.4.58 still presents this very same issue on Manjaro Linux as of november 2021. After having dowgraded to opencv-python 4.5.3.56 the issue is resolved

Thanks, I faced this issue on ubuntu 20.04, default install. Downgrade to 4.5.3.56 fixed it.

pip uninstall opencv-python
pip install --upgrade opencv-python==4.5.3.56

bestel74 on Nov 4, 2021

I’ve checked package 42 and it works fine. Thank you!

mshabunin on Aug 17, 2020

Please try to upgrade to the new 4.4.0.42 release which should have this issue fixed.

skvark on Aug 17, 2020

Yeah, I looked into Qt sources too. That PyQt link was helpful. The issue surfaced in the latest opencv-python versions because Qt version changed from 5.13 to 5.15. Qt 5.14 introduced those changes which apparently require the Info.plist file to exist. I can add it to the packages if I manage to figure out the paths and correct location. I do not own a Mac, so it would be helpful if someone could have a look into this locally on a Mac and test for a possible solution. I did open an issue about this here: https://github.com/skvark/opencv-python/issues/376

skvark on Aug 13, 2020

Now, as I tested a lot, I can confirm that the problem was produced by ‘cv2.imshow()’.

azataiot on Aug 14, 2020

Looks like Qt looks for Qt bundle (‘org.qt-project.QtCore’) and can not find it. Not sure if it is possible to trick it somehow, as I understand Info.plist file should exist. It crashes at this line: https://code.qt.io/cgit/qt/qtbase.git/tree/src/corelib/global/qlibraryinfo.cpp#n502 or here: https://code.qt.io/cgit/qt/qtbase.git/tree/src/corelib/global/qlibraryinfo.cpp#n512 or here: https://code.qt.io/cgit/qt/qtbase.git/tree/src/corelib/global/qlibraryinfo.cpp#n432

Perhaps it is possible to define QT_LIBINFIX and name the bundle correspondingly.

mshabunin on Aug 13, 2020

@magiwanders @bestel74 Please follow the issue here: https://github.com/opencv/opencv-python/issues/572

This issue is related to macOS and has been fixed.

skvark on Nov 4, 2021

This issue cannot be fixed in this repository. It’s very specific to the unofficial opencv-python pre-built binary packages: https://github.com/skvark/opencv-python/issues/376

skvark on Aug 14, 2020

I just encountered similar problem in pycharm. I was using latest version of opencv-python and python 3.7. When i use cv2.imshow(), i got the err: Process finished with exit code 139 (interrupted by signal 11: SIGSEGV)

So I installed the 4.3.0.36 version, then cv2.VideoCapture and cv2.imshow() works

moyinwong on Aug 14, 2020