I think this more-or-less corresponds to the first approach you described. It's ...

		neuronexmachina on June 19, 2018 \| parent \| context \| favorite \| on: Behind the Tech with John Carmack: 5k Immersive Vi... I think this more-or-less corresponds to the first approach you described. It's part of the Multiview Video Coding amendment to H.264: https://en.wikipedia.org/wiki/2D_plus_Delta