Gstreamer-OpenGL problem on iMX6

[Kumsaati]

Hello,
I want to use an opengl supported pipeline for my application on a iMX6
TinyRex module. For this, I started with a very simple pipeline: 

    v4l2src ! glupload ! fakesink

to see if I can start working with openGL. With a quick research, I realized
that since the system is working in a headless mode, I've set
GST_GL_WINDOW=gbm, but I couldn't manage to make it work even in this mode.
The debug log shows that it fails to create an EGL context saying
XDG_RUNTIME_DIR not set, and stops after saying EGL_NOT_INITIALIZED. The
whole output, acquired with GST_DEBUG=3,gl*:5 is  here
<https://pastebin.com/KPQXvSYp>  . Can anyone help me with making this
pipeline work?

Thanks,






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