That's what the "bmap"-parameter in the "media_"-instructions is for.

I guess a simple media_loop("FILENAME",panel.bmap,VOLUME) should work. Simply replace "panel" with - well, the name of your panel. Don't forget to add a handle so you can stop (and maybe tune) that later.

Hopefully, you won't have too much of an delay when the loop starts again. Keep the movies small.