Sorry for the late reply. Well, I've tried changing the statement with play movie, so it's pretty much like this (sorry, I'm currently not looking at my code and I don't remember much what's written):
Hi, this is my first time in this forum but not my first time using ren'py. I'm making a simple game as a good friend's present and it's already at its final stage, but there seems to be a problem. I use an ogv file for the credits title thing and it plays when I launch the game from ren'py, but I c...