"The Brilliance lies within Patrick's innovation. It is a work of art :)"

"After you enter it you need to press enter to save the string"

"i meant to say I use -A and -C"

"That is how I do it,  this command places both the data and the video over the same link but over different ports. Also, if there is video already coming over in a separate window (the D3D video window), you have to close it  first so that the video…"

"It looks like a video window. if it is the D3D video window that opens first, you must then close it before running the QT HUD app. The QT HUD app video window does not work, doesn't  overlay  inside the HUD until you do this. Only one video can…"

"What is the hidden window behind your command line window"

"I recall had a similar error when I had both the early plug-i version and the standalone version on my laptop, and they were competing. So, I removed both versions and re-installed the latest standalone. I would try that."

"See the earlier similar Comment by Steve on April 11, 2015 at 11:10am regarding this error message"

"I recommend that rather than using the plugin version, that you instead  install and use Patrick's standalone version as he recommends and supports.  It is an excellent GStreamer HUD option."

"Per the gstreamer wiki's, the correct  string to use for H264 streaming (to input and run on the client GCS pc) is to copy and insert the verbose output that is displayed at the server side (the entire caps string in the verbose output obtained from…"

"One other tip (from the gstreamer wiki's) I find useful. When you run raspi-vid (gstreamer) on the Pi, the command window verbose display output includes the string of the caps attributes like this example:
caps="application/x-rtp\,\…"

"Great! The ports are
14551 is used by the HUD telemetry
14550 is used by Mission Planner telemetry
9000 (or 5000 in my case) is used by the HUD for Gstreamer video "

"My guess is that Mission planner and HUD are both trying to use 14550 so one of them has to fail. If you hit the HUD wireless button it places the HUD on 14551. Try that and then open Mission Planner and connect. It may lake a little more time to…"

"you click on the HUD wireless icon button to connect to Mavlink for telemetry, correct?

and Mission Planner is using 14550 in the MP upper right hand connect menu? I can't tell in your picture with MP above (it is cut off)"