I'm getting this message silently on output window:
Exception thrown: 'System.ArgumentException' in AForge.Video.FFMPEG.dll
How do I allow VS to raise that exception?
You can configure VS to break even when the exception is handled in user code. Typically the exceptions dialog can be open with CTRL-ALT-E, but you can find it in the Debug-> Windows menu for VS2015, or directly in the Debug menu for older versions.
Anyway, once you open it, find the System.ArgumentException exception and select break when thrown. You also have some additional options in the context menu:
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