How to loop a Startup Movie without using c ++?

Hello,

how to loop a startup movie without using c ++?

I make a game for android and I use level streaming. When I start the game on the phone, there is a black screen for about 20 seconds.
I would like to make startup loading with a video animation and I want it to loop, but I don’t see any loop option.

Is there any other way to do a startup loading animation instead of adding a movie?