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.
Mixes current masked Virtualdub frame with a previous frame
...Add "filter blenderM" in your virtualdub filter chain. This first instance must be to Store the current frame to A
2. Then add the filters you wish to modify the video.
3. Put it in your filter chain and select "Blend"
a. You can blend the current video frame with the one stored in A by selecting the percent
Slinspit is command line tool for creating slideshow from still photos. Includes several effects (titles, Ken Burns, blend etc.) and allows easy adding of new ones.