I don't know if the following will help in tracking this down but I'm
developing code in openCV and sometimes see this. It happens after
creating a 'namedwindow()'. If the new window isn't loaded with an
image, it seems to time out and give the error. I was investigating some
timing issues in my code and decided to put a waitkey() delay to allow
window generation to finish before doing the timing checks and I started
getting the "G_IS_OBJECT (object)" failure. I got rid of it by inserting
an imshow() for each new window and the problem disappears.
The following snippet may help, if the three lines after the comment
are removed then the report occurs three times
namedWindow("Input-Gray", WINDOW_NORMAL);
createTrackbar("StdDevVal", "Input-Gray",&SDPosn,255, SDTBEvent);
createTrackbar("MeanVal", "Input-Gray",&MeanPosn,255, MeanEvent);
createTrackbar("Deriv", "Input-Gray",&DerivPosn,255, DerivEvent);
namedWindow("SDMasked", WINDOW_NORMAL);
namedWindow("MeanMasked", WINDOW_NORMAL);
namedWindow("DerivMasked", WINDOW_NORMAL);
imshow("Input-Gray", M_gray);
// the following stops the reporting of :-
//(Input:4135): GLib-GObject-CRITICAL **: g_object_unref:assertion
'G_IS_OBJECT (object)' failed
// seems to be associated with creating a window and not showing an
image!
imshow("SDMasked", M_gray);
imshow("MeanMasked", M_gray);
imshow("DerivMasked", M_gray);
if( cv::waitKey(0) != 0x20 ) // wait for windows to settle
.....
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https://bugs.launchpad.net/bugs/1582496
Title:
GLib-GObject-CRITICAL failures during Ubuntu 16.04 bootup
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