I'm not sure how difficult this would be since I have no idea what tool chains you are using to write Mezzmo, however...

What are the chances that you could port Mezzmo over to Linux? We already know that ffmpeg, which is one of the underlying systems that Mezzmo uses for video works well with Linux.

I would be more than willing to be a guinea pig for that. In addition to Windows, I run multiple variants of Linux. Most commonly Fedora Linux and CentOS Linux (clone of Red Hat Enterprise Linux).