Checking for a parent is not enough, it must have a toplevel one. If widget has no toplevel parent then add it in a GtkWindow, that make it usable from gst-launch-1.0. https://bugzilla.gnome.org/show_bug.cgi?id=751104
Description
Enthält Gestreamer mit dem stand vom Yolo Tensordecoder + OpenVINO Execution Provider
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