I recently wrote an application to analyze video using C# and AForge.NET; it was a pretty nice library. You can do all of the overlay in .NET, which is a lot easier (although slightly less efficient, but who cares) than trying to do it with some of the video APIs out there (like directshow, which can be difficult to get decent overlay, particularly with the DirectX-ish renderers)
kidjan
2010-07-29 16:47:51