I have a video of someone talking against a green screen background. I would like the video to be transparent within the Edge Animate composition wherever the green screen is visible. Is it possible to do this? And if so, what is the best method with the most browser support these days? I'm comfortable with creating an additional alpha channel mask of some sort in Premiere if need be as well.
It's possible to do, but only one HTML5 video format and only one browser supports it currently: Webm video playing in the latest version of Chrome.
Animate doesn't directly support webm (they don't render on the Stage), but it will pass webm video through to browsers that support it - and in the case of video with transparency, that's only supported in the latest version of the Chrome browser - no Firefox, IE, Safari, or Opera support.
More info here:
EDIT: Correction - it also works in Opera 22! But again, no Firefox, IE, or Safari support.