Encoding an mp4 file with alpha channel? ...

I read on one of Apple's pages about Quicktime that it does support an alpha channel for mp4 h.264.... the problem I am having is that despite hours of searching and trying out different software trials I have yet to find one software package that can convert a video format that has an alpha channel to an mp4, keeping the alpha channel in the final mp4 output. I am wondering if anyone knows of a solution for this, thanks.

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