How to render a video without a background

[xX-Towrd01-Xx]

I'm trying to make some death counter overlays for a project i'm working on for my youtube channel for a minecraft project. But i don't know how to render without having to have a black back ground there.

The death counters are the players minecraft characters walking on screen, then dieing with a number next to their avatar to show how many times they have died, like Haat Films do in their videos: http://www.youtube.com/watch?v=r6DJq5i2ms4&feature=relmfu in this one @15.37 to see what im on about. I have made one of these animations albeit worse ones for each of the the characters taking part in my series. IS there any way that i can render them out of after effects without the black background so i can use them in Sony Vegas? or is it impossible and i may aswell just render the whole videos out in After effects, although Vegas is better for sound and long pieces of editing?

Any help would be much appreciated

Thanks

[xX-Towrd01-Xx]

just realised i've managed to post this in the wrong part of the forums D: how do i delete it?

[zoobie]

You can click "report" and ask to have it moved to the appropriate forum.

[jagabo]

See alpha channel, or alpha mask. For example:
http://www.youtube.com/watch?v=tp44lmXFboc
http://www.youtube.com/watch?v=1RDbY_Uu7E8
http://www.youtube.com/watch?v=q9vHSuLx25g