GoPro Cams do not work 'live'. GoPro
say ' Yes, maybe one day...' You will notice as you plug the silly little jack plug into the cam, to display the RECORDED (ONLY) video or stills on a video display, you momentarily get the live image
in from of the camera through to the video display, then the cam software detects the plug is connected, and switches to playback mode. I have open my cam and am going to dig to understand how the detection of the jack plug works and try to disable that so
that the camera does not know about the connection and hopefully outputs what it sees live....