Flow for OS X Desktop

[Jules Hablot]

Hi ! 
I am a new user of GStreamer on Mac OS X EL Capitan 10.11.3. 
I have installed GStreamer from http://gstreamer.freedesktop.org/data/pkg/osx/1.7.1/ with .pkg (version devel and standard version).
I am trying to catch the desktop to send it to an other display. 
I streamed my webcam, with success : 
$ gst-launch wrappercamerabinsrc mode=2  ! video/x-raw, width=320, height=240 !  osxvideosink
But I do not find the descriptor for my desktop anywhere.
Do you know the equivalent of ximagesrc from Ubuntu to Mac OS X ?
Could you help me ?
Thanks a lot,

Jules H.
Mathias B.
RICM4, Polytech Grenoble, FRANCE
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