MediaPortal Wiki 
GraphEdit
GraphEdit is an advanced utility which allows you to create DirectShow graphs, test installed DirectShow filters and connect to graphs rendered by other applications.
A graph is a collection of DirectShow filters connected to each other. MediaPortal creates ?DirectShow graphs for viewing Movies, DVD's and TV, listening to radio and transcoding or compression of recorded TV shows. You can also use GraphEdit to inspect any type of DirectShow filter installed on your system.
Download GraphEdit from here.