This is basically a set of wrapper scripts for ffmpeg that I use regularly, mostly to quickly edit dog photos and videos... no seriously.
Scripts:
sort-mediacut-videoresize-videoconvert-videomake-gifremove-audioslow-motion-correct
All of these have --help flags which detail the usage.
Technically this is all portable Python but I only really care about Windows, therefore there's a simple build.bat script that will lint and install all of the scripts. It just assumes you have the default Python for Windows installation setup. Also assumes you have ffmpeg.exe and ffprobe.exe somewhere in your %PATH%.