The HDMI port on your macbook is an output port, not an input. That means, if you want to capture the GoPro, you need an HDMI capture device like this.
Image from Pionner.com
states "connect a digital camera to your laptop to stream and mix live video footage" ...
(Mac) ...Rekordbox Video gives you the option to connect to the Laptops built in camera ...hooking up a webcam via USB also works, however theres no explanation how to hook up a GoPro ?
Micro HDMI doesn't work connecting camera to laptop ...plus this wouldn't work in a gig situation because the Mac only has 1 HDMI and you would need two as you need to also connect to a projector.
Has anyone found the answer to this ?

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The HDMI port on your macbook is an output port, not an input. That means, if you want to capture the GoPro, you need an HDMI capture device like this.
I visite the link, I don't understand how it work.?
You connect the GoPro in the HDMI IN? but after?
@Martin > Do you have an HDMI capture device in your computer?