OpenCV GUI issue in Python

Question

I am trying trying to display webcam footage using openCV on Ubuntu but i am getting the following error:

Error: BadDrawable (invalid Pixmap or Window parameter) 9Major opcode: 62 (X_CopyArea)Resource id: 0x3800056]

Here is my full code

import cv2

cap = cv2.VideoCapture(1)
cap.set(3,320)
cap.set(4,240)
while(1):
    _, frame = cap.read()
    cv2.imshow('frame',frame)

    k = cv2.waitKey(5) & 0xFF
    if k == 27:
        break

cap.release()

cv2.destroyAllWindows()

I have tried googling the error and it seems to be GUI related. I have also read the docs on imshow and I seem to be calling it fine, can anyone figure out why I am getting this error.

Thanks

i can run this on raspbian and it works fine. and the camera light turns on so I am assuming it is not null, how would I check? — wonderWall
– wonderWall, Commented Aug 8, 2018 at 12:48
Try debugging it. Do you have 2 cameras? If I remember correctly the default camera is on number 0, therefor you might need cv2.VideoCapture(0). — AndrejH
– AndrejH, Commented Aug 8, 2018 at 12:52
I have tried 2 different cameras at different points in the hardware array. 0, 1 and the webcam works though other applications (i.e Cheese) — wonderWall
– wonderWall, Commented Aug 8, 2018 at 12:56
What if you try the example from the documentations? docs.opencv.org/3.0-beta/doc/py_tutorials/py_gui/… — AndrejH
– AndrejH, Commented Aug 8, 2018 at 13:13

AndrejH · Accepted Answer · 2018-08-09 08:51:12Z

1

Seems like a problem when Python tries to present the window. It's probably an OS issue. Try editing the /etc/environment.

sudo nano /etc/environment

Add this line:

QT_X11_NO_MITSHM=1

Also try running your app as sudo and checking this for any solutions if before mentioned doesn't help.

edited Aug 9, 2018 at 8:51

answered Aug 9, 2018 at 8:45

AndrejH

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2 Comments

wonderWall Over a year ago

Thank you!! this fixed the issue.

AndrejH Over a year ago

Glad to help :) Please accept the answer if it solved your issue.

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