Removing the background color of composition while rendering to AVI format

Hello,
I am wondering if some one could help. Appears to be a simple issue. However, I am not sure how to accomplish this.
I created a new composition withe black background. Then created a couple of layers in which I have a simple animation of globe spinning. I rendered that composition (with RGB+alpha channel) into an AVI (windows) file. But when I play that movie in the Media player the black background is still there. How to get rid of it. I want to use that video clip in presentation layered over something else. Hence I do not want the background color. Thanks in advance for the help.
Jag

>But when I play that movie in the Media player the black background is
>still there. How to get rid of it.
Alpha channels are merely transparency information or, more correctly, an information on how to copy and blend the background pixels with the foreground to get the illusion of transparency. It's still tied to the foreground pixels. There is no such thing as a pixel with no color consisting of thin air. Any program that does not interpret the Alpha channel will correctly show the foreground color, which is the composition background color if rendered from AE. MediaPlayer does not care about Alpha as do most other such tools. It's as simple as that. If you really need to use the transparency, you will have to load it into a program that actually accesses the Alpha channel info - such as AE.
Mylenium

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Removing the background color of composition while rendering to AVI format

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