System information (version)

• OpenCV => 4.4.0.44
• Operating System / Platform => Ubuntu 18.04.5
• Compiler => Visual Studio Code

Detailed description

When I import matplotlib.pyplot and uses cv2.imshow the window will just close on any key I press except for spacebar and Esc. The following code will not run but it returns no error, it simply stop running. It started after I upgrade my opencv from 4.2 to 4.4. I had tried to import matplotlib only and other matplotlib modules and they does not cause any problem.

Matplotlib version 3.3.2

Steps to reproduce

importcv2importmatplotlib.pyplotcap=cv2.VideoCapture("video/7.mp4")whileTrue:(ret,frame)=cap.read()ifnotret:breakcv2.imshow("Processed Output",frame)ifcv2.waitKey(1)&0xFF==ord('q'):breakcv2.destroyAllWindows()cap.release()print("End")

When the video ends byitself, End will be printed. When I press any key excpet spacebar and Esc while video playing, End will not be printed. I had tried with other code replacingprint("End") and they will not work as well. So I pretty sure it crashes.

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