I've rendered out a short video file in After Effects with an alpha channel in a few different ways, but I can't seem to get it below 3GB. Is there any way to get the file smaller without diminishing the quality or making the composition size smaller? I'd like to get the file size smaller to put into the cloud for use in a group project, and while 3GB isn't really all that huge of a file, I have several files with an alpha channel that others need to access.
The smallest file size with an alpha channel that is still production quality would be a QuickTime JPEG 2000. Set the quality to about 85 to 90%.