Ytukyg

I have built a Qt application in C++ that utilizes OpenCV and runs on a Raspberry Pi. For some reason I cannot get this application to run directly on the Raspberry Pi's display.

The application runs fine if I send the display to a remote xserver, but if I try and run it and display it on the xserver running on the Pi I get the following errors:

libEGL warning: DRI2: failed to authenticate

qt5ct: using qt5ct plugin



** (LCVTrial_CppOpenCV:1914): WARNING **: Error retrieving accessibility bus address: org.freedesktop.DBus.Error.ServiceUnknown: The name org.a11y.Bus was not provided by any .service files



(LCVTrial_CppOpenCV:1914): GLib-GObject-WARNING **: cannot register existing type 'GtkWidget'



(LCVTrial_CppOpenCV:1914): GLib-GObject-CRITICAL **: g_type_add_interface_static: assertion 'G_TYPE_IS_INSTANTIATABLE (instance_type)' failed



(LCVTrial_CppOpenCV:1914): GLib-GObject-WARNING **: cannot register existing type 'GtkBuildable'



(LCVTrial_CppOpenCV:1914): GLib-GObject-CRITICAL **: g_type_interface_add_prerequisite: assertion 'G_TYPE_IS_INTERFACE (interface_type)' failed



(LCVTrial_CppOpenCV:1914): GLib-CRITICAL **: g_once_init_leave: assertion 'result != 0' failed



(LCVTrial_CppOpenCV:1914): GLib-GObject-CRITICAL **: g_type_add_interface_static: assertion 'G_TYPE_IS_INSTANTIATABLE (instance_type)' failed



(LCVTrial_CppOpenCV:1914): GLib-GObject-CRITICAL **: g_type_register_static: assertion 'parent_type > 0' failed

No errors are shown when running to a remote display.

I made a "stripped down" version of the application with only the GUI, removing OpenCV, and it runs fine on the Pi's display.

Any ideas or direction on where to look / investigate would be appreciated!

there are some missing libs on Raspi
try on raspi terminal

sudo apt-get install at-spi2-core

in /etc/environment add

QT_QPA_PLATFORMTHEME=gtk2

and do not forget update gstreamer

Hope it helps