Decklinkvideosink 1.9.90 Alpha Keying

[Digits]

I see the decklinkvideosink can now accept many new pixel formats 
including RGBA.  Certain Decklink cards support both internal and 
external keying so is it possible to enable the external keying feature 
when sending RGBA frames?  I cannot see a property to set for this.

Regards,

Dave.
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