I have a hero3 black version, and this video was shot in 1080p at 30 FPS (frames per sec). Filming in 4k is the best yes, but you have to make sure your SD card can handle the record speed and space for a 4k, or else it comes out choppy and ugly. The key is not loosing the HD resolution when transferring footage, say over the wifi. Get GoPro studios if you have a computer. Macs work better than a PC. If you do have a PC, make sure you have nothing else running in the background.