I have a GH4 and can not work out how to get composite video out of the AV out socket.
Anyone know if this is even possible?

I guess not then. No video out of an AV out socket, what is panasonic playing at?

I've worked it out, the AV out socket only gives an output on playback! WTF this is a camera, AV out should be live, what the hell is Panasonic playing at???
Perhaps some feedback to Panasonic design department, reminding them this is a camera first and not just a video player.