(In reply to Julien Isorce from comment #14)
> (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)

Ah if this is wayland, then try: waylandsink (instead of xvimagesink), or
autovideosink