yt-chapters

python3 chapters.py transcript.srt --target 8

The rules, which are not optional

A chapter list that breaks any of these silently does not become chapters at all - the block just sits in the description doing nothing:

• The first entry must be 00:00.
• There must be at least three.
• Each must be at least 10 seconds long.

The tool checks all three and tells you when a list is invalid rather than letting you paste it.

Retitle every line