I recently attended a presentation of new startups at my University, and I think that the products of FortressWare are exactly what you are looking for: http://www.fortressw.com/showdemo2008.htm I haven't tried them, but from their presentation it seems they provide what you need.

Yet another "credit due" department post. But at least here is a video: http://pages.cpsc.ucalgary.ca/~saul/wiki/uploads/P ress/07-mediaclip-icore-full.wmv U. of Calgary actually motivated a start up company called SMART technologies to commercialize this technology.