I have a 10:34 minute recording, and here are some the issues I ran into after looking at it in the Replay Mod. (This was done on multiplayer server).
Only I am visible, the other players for some odd reason are simply not visible (They teleported to me after I joined the server, so may that be what caused it? There interactions are recorded, but not the player themselves).
It also seems that with shaders (even when off, and I know its not a compatible thing atm, but I'll just mention it), is when a player has his personal time set on a server, like using /ptime . So for example if the server time is 6AM, and the player changes his personal time to 9PM, its going to at a 1 second interval go to 6AM and then back to 9PM, repetitively throughout the recording, until you start the game again without shaders mod.