CapturePreviewCSharp

I'm trying to build CapturePreviewCSharp solution using Visual Studio 2022 version 17.5.4.
The project and files are from the 12.4.2 SDK, and when I hit "build" I get the following compiler error:
Error CS0246 The type or namespace name 'IDeckLinkWPFDX9ScreenPreviewHelper' could not be found (are you missing a using directive or an assembly reference?) \Blackmagic_DeckLink_SDK_12.4.2\Blackmagic DeckLink SDK 12.4.2\Win\Samples\SignalGenCSharp\PreviewCallback.cs 56
What am I missing?

[Cameron Nichols]

Hi Simon,

Please check that you have minimum Desktop Video 12.3 installed. The IDeckLinkWPFDX9ScreenPreviewHelper interface was added in that release, so an earlier installation will not have this interface registered.

Regards
Cameron

Thank you, that has worked. I must have had an older version installed.

Having said that, the project now builds as expected, and it finds an input on Decklink Quad (2) however nothing is drawn in the preview frame. Is the preview frame likely to work if the frame data is YUV?

Thanks,
Simon

[Cameron Nichols]

Hi Simon,

Yes, the CapturePreviewCSharp preview will work for both YUV 422 and RGB 444 inputs.

It is best to use DeviceStatus/DeviceStatusCSharp to check the input state of the capture when CapturePreviewCSharp is running. Pay particular attention to "Video Input Locked" and also the other detected video input fields.

Regards
Cameron

Hi Cameron,
This is the output of both CapturePreviewCSharp and DeciceStatusCSharp

It clearly shows 1080p60 coming in, and I am not seeing any errors, input is locked, etc.

But you can also see there is no preview.

Any help is greatly appreciated.
Thanks,
Simon