It differs from other movie making tools in that you can re-use assets and events from the game world in your productions, It merges the complete workflow of movie creation, editing, motion capture and post processing effects into one system. Source Filmmaker boasts a what you see is what you get approach of movie creation and editing. It doesnt require a render farm cluster, or very expensive compute processors, it functions well on a relatively modern PC.
The 3D recordings you create in the Filmmaker can contain recorded gameplay, objects, cameras, lights, particles, animations, effects, and sounds as well as the motion information for how each element changes over time.
SFM gives the user a “Work Camera” that enables them to see what they are doing without messing up the scene cameras.