(In reply to 247 from comment #13)
> tried again and this time the command gave me this result
> 
> error: XDG_RUNTIME_DIR not set in the environment.
> No protocol specified
> No protocol specified
> error: XDG_RUNTIME_DIR not set in the environment.
> No protocol specified
> No protocol specified
> set pipelines to PAUSED ...
> No protocol specified
> ERROR: pipelines don't wan't to pause.
> ERROR: from the element /GstPipeline:pipeline0/GstXvImageSink:xvimagesink0:
> Could not initialise Xv output
> additional debug informations:
> xvimagesink.c(1759): gst_xv_image_sink_open ():
> /GstPipeline:pipeline0/GstXvImageSink:xvimagesink0:
> Could not open display (null)
> set pipeline to NULL ...
> free execution on the pipeline...
> 
> 
> of course i translated everything into english...anyway i don't think it's a
> matter of x.org or wayland cause i've tried to set x.org as display driver
> but had exactly the same error...so don't think comparing gnome or cinnamon
> will help at this point...

Try installing libxv1 or try to use ximagesink (instead of xvimagesink)