USB camera floods terminal with X11 KeySym warnings

On raspberry Pi, using kivy to stream images from a TIS USB 2.0 camera (DFK 72AUC02). When I start streaming from the camera with gstreamer, this message FLOODS the terminal:

The key you just pressed is not recognized by SDL. To help get this fixed, please report this to the SDL forums/mailing list <> X11 KeyCode 220 (212), X11 KeySym 0x1008FF8F (XF86WebCam).

Is the camera sending “keystrokes”?

  1. Can I reomve the print out of that message, so that I can use my terminal while running my program?
  2. Can I fix the underlying issue? (I don’t know what the issue is, though)

I am really out of my depth here, all thoughts appreciated!