Success! I got video working with audio in sync smooth and with real time playback too! To boot, it also scales with the game window…
The kicker? it still loads the game in the background ready for the player to enjoy the main menu once done!
Still fiddling, just need to be able to control the main view to switch media should the game call for an end credits or something later in the game, forgot how to do it now but should be able to find it again somewhere!
Feels good though!