Use a movie with alpha in Self-Ilumn Material

Hey guys, I was wondering if is there a way to make a movie (quicktime mov) with alpha channel to work as a texture, I mean by this, I have my video and an alpha, I want the diffuse to work as the color, and what's white on the alpha to work as the luminance intensity, same as you would do with a normal texture map. I tried with a texture with alpha, and it works like a charm, when I bring my movie with alpha, it stops working, I used the script to make the video work when hitting play, but apparently it's something related with the video itself, maybe the codec, or maybe Unity can't handle videos with alphas? Ok, hope someone solved this already. Thanks guys.