Built in Adobe Media Encoder, on Mac load preset file into Library > Preferences > Adobe > Common > AME > 7.0 > Presets
I recommend conforming any alternate 4K or 5K formats to a 3840×2160 23.976 timeline in Adobe Premiere prior to YouTube upload.
This is a tried and true 4K upload preset that you can see everyday working examples on http://www.youtube.com/YouTubeNation
No, this is not a VP9 preset. It futureprooofs your content to be flagged as 4K so as VP9 encoding kicks in retroactively you’re all set.
proactively • 4K for the masses • peter
Here’s a screengrab of the settings in case you are using an older version of AME