Blackmagic Forum

Hi,

I'm using C# code provided in the SDK as example and I'm getting an error while capturing still

Solution: StillsCSharp
Issue In Function :
public Bgra32VideoFrame ConvertFrame(IDeckLinkVideoFrame srcFrame)
{
Bgra32VideoFrame dstFrame;

// Check whether srcFrame is already bmdFormat8BitBGRA
if (srcFrame.GetPixelFormat() == _BMDPixelFormat.bmdFormat8BitBGRA)
dstFrame = (Bgra32VideoFrame)srcFrame;

else
{
dstFrame = new Bgra32VideoFrame(srcFrame.GetWidth(), srcFrame.GetHeight(), srcFrame.GetFlags());
m_deckLinkConversion.ConvertFrame(srcFrame, (IDeckLinkVideoFrame)dstFrame);
}

return dstFrame;
}

Issue in line:
dstFrame = (Bgra32VideoFrame)srcFrame;

Exception:
Unable to cast COM object of type 'System.__ComObject' to class type 'StillsCSharp.Bgra32VideoFrame'. Instances of types that represent COM components cannot be cast to types that do not represent COM components; however they can be cast to interfaces as long as the underlying COM component supports QueryInterface calls for the IID of the interface.

Windows OS:
Windows 10

Please help me in resolving the issue

Hello, I have the same problem, could you solve it?

Hi Cristhian,

Please download the latest Desktop Video SDK 11.0, this issue was resolved in this release.

Kind Regards
Cameron

Thank you Cameron
I already have it but now I have another problem in this new SDK in Strill.cs in the VideoFrameArrived method in the code "if (m_captureCountdown! = Null)
m_captureCountdown.Signal (); "I missed the following error" System.InvalidOperationException: 'Invalid attempt to reduce the count of the event below zero'. "