Command-line video compositing and audio mixing tools
Render is a program for creating composite BMP image sequences. These images are composited as specified in a text configuration file.
Mixer is a program for mixing film soundtracks. It accepts input files in WAV format and outputs a mixed soundtrack in WAV format. Each input channel can contain one or more audio files that are edited and mixed using a cue sheet. The maximum number of channels is a compile-time parameter.
Kumaji is an advanced subtitle rendering library aiming for complete cross-platform support, complete and compliant support for all common subtitle formats and, of course, speed. The source code is also intended to be easy to understand and hack at.