Draft: Shiny new media factory for Chromecast

The MR is infested with a ton of TODOs, but the structure is more or less final. I will try to finish off the important ones first to get this merged soon.
The necessary functional part that does not work is the vp8 codec. Audio is transported fine with WebM and Matroska containers so every other part of the machine is working, just in place of the video is a blank screen.
I would love some help here!