I dont know if this is known already, but someone released bink 2 encoder on github:
https://github.com/marcussacana/Bink2
Here are the files:
Bink2.7z
and here is proof of concept I just tested:
kb2proof.png
Also read this:
https://github.com/marcussacana/Bink2/issues/1
PS(You don't need those dll's to encode, only for game to play, but only 32bit were provided.)