Hey baldand,
Tried to contact you on IRC, but time-zones and all, I guess it's easier to answer here, then other people can know the response also, if they don't already.
I believe mlrawviewer can handle DNGs, is this correct?
In addition, should it be able to handle DNG raw video from a blackmagic camera? (Turns out there's no a lot out there to view blackmagic raw files on earlier versions of mac (or probably on linux) (I'm on ubuntu, a friend is on mac)).
If mlrawviewer doesn't support it, and there's the possibility that it could, I'm trying to get my hands on a blackmagic file (from my friend), and I'll try to code something to handle it to push to the main repo.