Different video on SDI output A and B (DeckLink 4K Extreme)

Hello,

I have the following problem.
I'm using a deckling 4k extreme card to try to generate a fill and alpha key output.
However, i can't find a way to generate an independant signal for SDI ouput A and B.
I've tried to modify the sample SignalGeneratorCSharp project provided by the SDK.

Even in the documentation i can't find anything about this subject.
At this time the sample project just broadcasts it's frames to both channels.

If it's not possible with the bmdVideoOutputFlagDefault flag, then i would like to know how to generate and output a left and right signal for the bmdVideoOutputDualStream3D modus as i can't find anything about this either.

Thanks in advance,
Tim

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