Frei0r

frei0r /ˈfraɪ.ɔːr/ is a simple cross-platform framework for video effects. It provides filters, mixers and generators by means of minimalistic plugin API. The behaviour of the effects can be controlled from the host through simple parameters. The intent is to solve the recurring reimplementation or adaptation issue of standard video 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 (NLE), hardware accelerated shader effects, or high precision video processing. What frei0r does provide, besides a collection of usable video plugins, are C and C++ code reference implementations for over an 100 different video manipulation algorithms, licensed under the GNU General Public License.

The frei0r API is not meant to be a competing standard to more ambitious efforts. The current implementation of frei0r is very lightweight, consisting of just a single C/C++ header file. Since its birth in 2004 frei0r became a de facto standard video plugin collection for several free and open source applications, as LADSPA did for audio plugins.