rendering with a transparent background

Hey, I want to render a quicktime video of a bullet out of blender, and the bullet goes shooting by the camera. I want the background to be transparent so I can just drop it in after effects and there it is set to go with a transparent background. I know quicktime has an alpha channel, so it should work. I do’nt want to do png though, I want to do quicktime but don’t know how. : ) how do I do it? any help would be GREATLY appreciated,



Enable RGBA and Quicktime as the format.