[Rumen Serafimov]

Hi Arka,

to utilize Fill and Key output you need to use Decklink Pro. It is capable to output Fill and Key signals through its two SDI outputs.

If you have any additional questions I will be more than happy to answer at support@playbox.tv.

Rumen Serafimov
R&D, http://www.playbox.tv
support@playbox.tv