Gstreamer error: XDG_RUNTIME_DIR not set in the environment

I am using Ubuntu 18.04 LTS on the Windows 10 PC with Windows Subsystem for Linux turned on so that I can run Linux on the PC. I tried to use Gstreamer-1.0 then.

When running the line:

gst-launch-1.0 videotestsrc ! autovideoconvert ! autovideosink 

I get the error:

error: XDG_RUNTIME_DIR not set in the environment.

And then it does nothing. What must I do to fix this?

For extra info here is the complete 'code':

gst-launch-1.0 videotestsrc ! autovideoconvert ! autovideosink
Setting pipeline to PAUSED ...
error: XDG_RUNTIME_DIR not set in the environment.
error: XDG_RUNTIME_DIR not set in the environment.
Pipeline is PREROLLING ...
WARNING: from element /GstPipeline:pipeline0/GstAutoVideoSink:autovideosink0: Could not initialise Xv output
Additional debug info:
xvimagesink.c(1773): gst_xv_image_sink_open (): /GstXvImageSink:autovideosink0-actual-sink-xvimage:
Could not open display (null)
Pipeline is PREROLLED ...
Setting pipeline to PLAYING ...
New clock: GstSystemClock
^Chandling interrupt.
Interrupt: Stopping pipeline ...
Execution ended after 0:00:05.400472100
Setting pipeline to PAUSED ...
Setting pipeline to READY ...
Setting pipeline to NULL ...
Freeing pipeline ...

1 Answer

The solution from this answer worked for me

To make it easy - more explained the new booting of my system.

After all explanations here I came to the result - and "env" in terminal said already that is right for these session:

These two rows to use the environment variable:

for the tmp behavior I have chosen:

mkdir -pv ~/.cache/xdgr

For setting the environment variable:

export XDG_RUNTIME_DIR=$PATH:~/.cache/xdgr

After closing the terminal and a new open for the recall of env they tells:

XDG_RUNTIME_DIR=/run/user/1001