Create a virtual monitor and stream it

Compressed UDP feed

# Transmit a x264 compressed low latency feed using udp
server: gst-launch-1.0 videotestsrc is-live=true ! videoconvert ! x264enc speed-preset=ultrafast tune=zerolatency byte-stream=true threads=1 key-int-max=15 intra-refresh=true ! rtph264pay ! udpsink host=%d port=9002
client: gst-launch-1.0 udpsrc port=9002 caps='application/x-rtp' ! rtph264depay ! avdec_h264 ! videoconvert ! autovideosink sync=false async=false

Virtual Monitor Streaming.sh

# xrand and gstreamer needed.

# https://bbs.archlinux.org/viewtopic.php?id=180904
# Using xrandr and gstreamer, you can stream a virtual monitor.
# Use xrandr to see the available "mode"
$ xrandr
Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 16384 x 16384
HDMI-0 disconnected primary (normal left inverted right x axis y axis)
DVI-0 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 510mm x 287mm
   1920x1080     60.00*+
   1280x1024     75.02    60.02  
   1152x864      75.00  
   1024x768      75.03    60.00  
   800x600       75.00    60.32  
   640x480       75.00    59.94  
   720x400       70.08  
VGA-0 disconnected (normal left inverted right x axis y axis)
DisplayPort-1-0 disconnected (normal left inverted right x axis y axis)
HDMI-A-1-1 disconnected (normal left inverted right x axis y axis)
DVI-D-1-1 disconnected (normal left inverted right x axis y axis)
# HDMI-O seems available, create a new mode:
$ xrandr --addmode HDMI-0 1920x1080
$ xrandr
Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 16384 x 16384
HDMI-0 disconnected primary (normal left inverted right x axis y axis)
   1024x768      75.03  
DVI-0 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 510mm x 287mm
   1920x1080     60.00*+
   1280x1024     75.02    60.02  
   1152x864      75.00  
   1024x768      75.03    60.00  
   800x600       75.00    60.32  
   640x480       75.00    59.94  
   720x400       70.08  
VGA-0 disconnected (normal left inverted right x axis y axis)
DisplayPort-1-0 disconnected (normal left inverted right x axis y axis)
HDMI-A-1-1 disconnected (normal left inverted right x axis y axis)
DVI-D-1-1 disconnected (normal left inverted right x axis y axis)
# Now output a workspace to that new virtual monitor
$ xrandr --output HDMI-0 --mode 1920 x 1080 --right-of DVI-0
# You will see a star (*) affixed to your new mode.
$ xrandr
Screen 0: minimum 320 x 200, current 2944 x 1080, maximum 16384 x 16384
HDMI-0 disconnected primary 1024x768+1920+0 (normal left inverted right x axis y axis) 0mm x 0mm
   1024x768      75.03* 
DVI-0 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 510mm x 287mm
   1920x1080     60.00*+
   1280x1024     75.02    60.02  
   1152x864      75.00  
   1024x768      75.03    60.00  
   800x600       75.00    60.32  
   640x480       75.00    59.94  
   720x400       70.08  
VGA-0 disconnected (normal left inverted right x axis y axis)
DisplayPort-1-0 disconnected (normal left inverted right x axis y axis)
HDMI-A-1-1 disconnected (normal left inverted right x axis y axis)
DVI-D-1-1 disconnected (normal left inverted right x axis y axis)
# If you try to move your mouse to the right side of your screen, it will now disappear. It's on the new monitor.

# https://stackoverflow.com/questions/33747500/using-gstreamer-to-capture-screen-and-show-it-in-a-window
# You can then stream that monitor somewhere. We will stream it to a new window but you can stream it to a network device.
$ gst-launch-1.0 ximagesrc startx=1920 use-damage=0 ! video/x-raw,framerate=30/1 ! videoscale method=0 ! video/x-raw,width=1280,height=960  ! ximagesink