How do I Load all videos before my game starts?

Hi everyone, first time posting in the forums here.

I've been working on a game with a couple webm videos inside of it. Each video plays at the beginning of a layout. My problem is this: Before each video starts, there's a brief flash of white. I know that there is a preload function for videos, but each time I enable it, I'm just greeted by a white screen. Is there any way I can load up all my videos in one layout before the game actually starts?

Thank you so much.

Are you sure you want to do that? That doesn't seem like a good idea.