Alpha Channels in Video

I looked around for any concrete information about including alpha channels (transparency) in video files. There's not a lot to be found easily out there, but I managed to figure out a format that works.

I just use QuickTime MOV file format with an RGBA color space, and it seems to work and be supported in pretty much any software I tested it in.

Good to know for the future, for video overlays/animations or other assets that need to be more flexible than just green screen animated videos which can have issues that this doesn't have.