Quicktime movie with transparency channel

[aaThomas]

Hi,

I am trying to make avatars by using a 'blue screen' technique:
* Filming people in front of a plain (white) background.
* Making the white parts transparent.
* Exporting the movie as Quicktime with a transparency channel.
* The movies are 256x256 pixels and 512x512 pixels.
* In Vizard, I use the movie as a texture on a quad.

Well, using 'Quicktime Alternative', I have gotten the movies to play, but the transparency does not work out. Do you have any suggestions on how to solve this?