It's been a while since I posted or have released an update to Serenity. Do not worry it isn't dead, I just have myself spread thin with leading the +Andmore Project
at the Eclipse Foundation. Once I get that settled down, I plan on making Serenity work with Plex's Universal Transcoder, which doesn't require a license or an api to use. Basically my understanding of this is that it translates the content into an MKV container with ACC audio and H.264 video which is pretty much available on most devices now.
No time frame for this, and I also still plan support for MediaBrowser.tv as well, but again no time frame until I get the Andmore Project going and on its feet.