TL;DR: Use ProRes, or command-line ffmpeg to get 6K into H.264 outside of standard level specs.
The problem with trying to encode and upload videos in 6K is that it's hard to encode 6K video using highly-compressed codecs that are upload friendly. H.264 is currently the standard video codec used to compress video for Internet sharing, and its highest performance level doesn't support video resolutions higher than 4K. Here are two possible solutions.
Video and stills comparison from 8 current 360 cameras including the Giroptic iO (pre-production), Insta360 Nano, LG 360 Cam, Nikon KeyMission 360, Panono, Ricoh Theta S, Samsung Gear 360 and Z CAM S1 (screengrab from 6K video).
Just before sunset today, a gorgeous double rainbow appeared over the San Francisco bay. I happened to have a fisheye lens attached to my camera, so I ran outside and snapped this shot. The rainbow stuck around for a few minutes, so I had time to shoot using a few different setups.
I recently went out and captured about 130 320-megapixel HDR 360 panoramas. Each panorama consists of about 4.25 GB of raw files from a Sony a7r II and takes nearly an hour to detect and render on a Windows machine running an 10-core Intel Core i7-6950X overclocked to 4.2Ghz and a Titan X GPU--about 5 days of continuous rendering (using Kolor Autopano Giga).
I'm willing to leave my machine on for 5 days to do this sort of rendering, especially when it's cold outside, as I'd have to run a heater in the room if I wasn't doing this sort of rendering, anyway (hah), but long rendering sessions like this require software that can essentially remain running continuously forever...
After much agonizing about the state of Apple's dedication in supporting power users, I decided to replace my Mac Pros at home and work with beefy Windows desktops (my laptop is still a MacBook Pro). At work, I now have a Falcon Northwest Talon (6-core), and at home, a custom 10-core workstation built by my good friends at Central Computers.
Nearly a year ago, Abraham Joffe of Untitled Film Works reached out to see if I would be interested in collaborating on an episode of Tales by Light, a relatively new TV series about photography. I watched some of the work in progress clips from other episodes of the show and was amazed by what such a small, tight team was able to do. I eagerly signed on.