Frei0r is a minimalistic plugin API for video sources and filters. The behaviour of the effects can be controlled from the host by simple parameters. The intent is to solve the recurring reimplementation or adaptation issue of standard effects.
Frei0r is not meant as a generic API for all kinds of video applications.
There is no support for the requirements of special application areas like non linear editors, hardware accelerated shader effects, and high precision video processing. These advanced issues are not even solved satisfactory for non cross application plugin apis and are still an evolving field.