Error while trying stream.getframeopen()

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C#

frame

Hi!

I am trying to get an image from an avi file. This was my idea of how to implement it:

manager = new AviManager(AviPath, true);
                stream = manager.GetVideoStream();
                stream.GetFrameOpen();

                stream.ExportBitmap(stream.FirstFrame, @"C:\test.bmp");

Sadly I always get an error in the GetFrameOpen() line. All it says is "Exception in VideoStreamGetFrameOpen!" without an inner exception or anything else.

I tried to just remove the line but then I'll get the error in the ExportBitmap line of type NulReferenceException.

The problem might be that my video is pretty small and has weird values:

CountBitsPerPixel 24,
CountFrames 1275,
FirstFrame 0,
FrameRate 15,
FrameSize 5184,
Height 1728,
Palette null,
Width 1

Does anybody see my mistake?
Thanks in advance!

What I have tried:

manager = new AviManager(AviPath, true);
                stream = manager.GetVideoStream();
                stream.GetFrameOpen();

                stream.ExportBitmap(stream.FirstFrame, @"C:\test.bmp");