OpenVIP is a free video-processing tool for Linux and Windows. It consists of two parts:

· OpenVIP core, which can be used for processing multimedia files from command line, or as a C++ library linked to other applications.
· OpenVIP editor, which provides a user-friendly GUI to the core and is based on the timeline concept - you place multimedia files on the timeline, apply filters, transitions, …

These are the main features of OpenVIP:
· Supports AVI, DV, MPEG, MOV, MP3, WMA, and WMV formats (via the FFmpeg libraries) as well as sequences of bitmap files (via the ImageMagick library)
· A lot of nice plugins including colour transformations, geometric distortions, basic sound processing and transitions between two clips
· A simple interface for developing your own plugins in C++

Download: OpenVIP 1.1.1