Automatically cut out sections of a video delineated by a sound.
I haven't done this myself, but I think it's quite doable.

First, you'd need to setup a ffmpeg script to demux the video into audio and video portions. Then, you'd need to apply a script that will analyze the audio file. Silence is easier to automatically detect in an audio file, assuming that you can produce the silence on site to mark the intervals (e.g. disconnect the mic for 2 seconds). You'd need to know some programming, but with something like Python it would be quite easy.

Finally, with the output of the script as times to cut between, feed this into ffmpeg again on the original file, using the -ss  -t  command.