[mnw21cam]

I wrote a command-line based video editing tool as a 300-line bash script. It reads a list of segments of video (source file, start position, length) to string together (including options such as image overlay, fade, fast forward, slow motion, static image) from a text file, and converts it into a Makefile with ffmpeg commands in it, which you can then run with whatever level of parallelism you wish. It treats the video and sound separately, and creates a video and sound file for each segment, using concatenatable formats for both. Then the final few make targets are to concatenate the video into one file, the sound into another file, and then multiplex them into a single file. Used it a few times for editing my own videos. It's a bit big to share here though.