Videos with Alpha Channels

I know Wirecast still doesnt support custom transitions with Alpha Channels, (which I've brought up elsewhere here previously) but does Wirecast 9 support ANY form of Video with alpha channels? Need this for some custom animated lower thirds and overlays, but I suppose my next question is this: If WC9 does support videos with alpha channels, What is the WC9 preferred format/codec for those videos so I can export them correctly and have video with transparency that will actually be read correctly by WC9 and also not cause it to crash? (like it did recently when I tried to throw a Quicktime Cineform RGB+Alpha video at it.)

 

Thanks.

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