PyQt5 and OpenCV have similar libraries; how to avoid conflict between the 2?

Question

I have PyQt5 and OpenCV in the same conda virtual environment.

opencv-python==3.4.1.15    
PyQt5==5.10.1

Whenever I run my PyQt5 app, I get many warnings like these:

objc[7992]: Class QCocoaPageLayoutDelegate is implemented in both /Users/alexryan/miniconda3/envs/qacker/lib/python3.5/site-packages/cv2/.dylibs/QtGui (0x109ae0290) and /Users/alexryan/miniconda3/envs/qacker/lib/python3.5/site-packages/PyQt5/Qt/lib/QtPrintSupport.framework/Versions/5/QtPrintSupport (0x10a387f20). One of the two will be used. Which one is undefined.
objc[7992]: Class QCocoaPrintPanelDelegate is implemented in both /Users/alexryan/miniconda3/envs/qacker/lib/python3.5/site-packages/cv2/.dylibs/QtGui (0x109ae0308) and /Users/alexryan/miniconda3/envs/qacker/lib/python3.5/site-packages/PyQt5/Qt/lib/QtPrintSupport.framework/Versions/5/QtPrintSupport (0x10a387f70). One of the two will be used. Which one is undefined.    
objc[7992]: Class QCocoaApplicationDelegate is implemented in both /Users/alexryan/miniconda3/envs/qacker/lib/python3.5/site-packages/cv2/.dylibs/QtGui (0x109ae0010) and /Users/alexryan/miniconda3/envs/qacker/lib/python3.5/site-packages/PyQt5/Qt/plugins/platforms/libqcocoa.dylib (0x10c6ed480). One of the two will be used. Which one is undefined.    
objc[7992]: Class QNSApplication is implemented in both /Users/alexryan/miniconda3/envs/qacker/lib/python3.5/site-packages/cv2/.dylibs/QtGui (0x109adffc0) and /Users/alexryan/miniconda3/envs/qacker/lib/python3.5/site-packages/PyQt5/Qt/plugins/platforms/libqcocoa.dylib (0x10c6ed4d0). One of the two will be used. Which one is undefined.    
objc[7992]: Class QCocoaMenuLoader is implemented in both /Users/alexryan/miniconda3/envs/qacker/lib/python3.5/site-packages/cv2/.dylibs/QtGui (0x109adff70) and /Users/alexryan/miniconda3/envs/qacker/lib/python3.5/site-packages/PyQt5/Qt/plugins/platforms/libqcocoa.dylib (0x10c6ed570). One of the two will be used. Which one is undefined.    
objc[7992]: Class QNSImageView is implemented in both /Users/alexryan/miniconda3/envs/qacker/lib/python3.5/site-packages/cv2/.dylibs/QtGui (0x109ae0330) and /Users/alexryan/miniconda3/envs/qacker/lib/python3.5/site-packages/PyQt5/Qt/plugins/platforms/libqcocoa.dylib (0x10c6ed660). One of the two will be used. Which one is undefined.    
objc[7992]: Class QNSStatusItem is implemented in both /Users/alexryan/miniconda3/envs/qacker/lib/python3.5/site-packages/cv2/.dylibs/QtGui (0x109ae0380) and /Users/alexryan/miniconda3/envs/qacker/lib/python3.5/site-packages/PyQt5/Qt/plugins/platforms/libqcocoa.dylib (0x10c6ed6b0). One of the two will be used. Which one is undefined.    
objc[7992]: Class QNSOpenSavePanelDelegate is implemented in both /Users/alexryan/miniconda3/envs/qacker/lib/python3.5/site-packages/cv2/.dylibs/QtGui (0x109ae0150) and /Users/alexryan/miniconda3/envs/qacker/lib/python3.5/site-packages/PyQt5/Qt/plugins/platforms/libqcocoa.dylib (0x10c6ed750). One of the two will be used. Which one is undefined.

What is the appropriate way to handle this?

I am having similar problem on mac with PyQt and opencv. Were you able to find a solution? — Punit Soni, Oct 27 '18 at 22:02
@sona no. The question was also posted to the QtForum but this forum currently appears to be down: https://forum.qt.io/topic/93012/how-do-i-specify-which-of-2-versions-of-the-qt-libs-should-be-used — Alex Ryan, Jan 16 '19 at 20:07

score 14 · Answer 1 · answered Dec 27 '19 at 22:48

14

I solved the problem by uninstalling opencv with the GUI and installing the headless version:

pip uninstall opencv-contrib-python

pip install opencv-contrib-python-headless

The namedWindow function in opencv still works.

answered Dec 27 '19 at 22:48

Randy Westra

141
1
4

I've just replicated this and tested what you suggested and it worked, So it's a +1 from me. – Rudder Dec 27 '19 at 23:10
I searched a lot about this question and many answers are too complex. This one is simple and worked. – Holsety May 24 '20 at 13:05
Solved the issue for me as well. Thank you so much! – Tom Aug 11 '20 at 14:59

score 1 · Answer 2 · answered Nov 10 '20 at 12:56

1

In my case, I solved the problem removing opencv-python

pip3 uninstall opencv-python

and then installing opencv-headless

pip3 install opencv-python-headless

After that, my application run again.

answered Nov 10 '20 at 12:56

Moises Santana Pereira

11
4

PyQt5 and OpenCV have similar libraries; how to avoid conflict between the 2?

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