The argument is ID of the video.
If commercials are manually edited it uses Blocks key to generate commands for FFmpeg. Not sure if this will work 100% of the time. If FPS is not integer number I see discrepancy in number of frames defining each block vs frames from "Commercials" key - maybe it's due to rounding therefore timestamps in seconds are used and -ss -to format is used instead of -ss -t. Also it merges blocks of the same type being neighbors in one.
Gist it's my last script as tomorrow my subscription will end