Media Framework movies specification

Hi! I am working on a game with several prerendered cinematics that will be included in the game in MP4 format. We have the Media Player working already, but what bothers us is a lack of more detailed specification on what formats are recommended or at least officially supported. The Media Framework Technical Reference mentiones only file types and encoders, and not particular frame sizes, framerates or bitrates. I have found several forum threads from 2015 that cite 720p as maximum video frame size, however I have seen no proof of that in official engine documentation. Also, we’ve got 1080p MP4s working already - without any apparent problems - on our PCs and PS4 devkits.

So what is the recommended or officially supported specification for MP4 movie files? Should we stay away from 1080p? Why?