Automatically finds chapters for your anime files.

Place the "autochapters" folder in your mpv scripts folder. Do not take the Lua file out of the folder.
This script requires curl and guessit to be installed and accessible within Path.
For Windows grab the curl and guessit-windows.exe binaries. Rename the guessit file to guessit.exe.
Use your package manager on Mac/Linux.

Open any anime episode. The offline database will automatically be cached on first launch.
If your file did not already have chapters, this script will extract the anime title and episode number from the filename, and look for matching chapters online.
Filenames are processed on your local device and never sent over the internet.

Any script that uses chapters such as chapterskip can be used to automatically skip openings/endings.
Chapter data is also available under the user-data/autochapters property, and filename parsing results at user-data/guessit.

Aniskip for the API serving chapters.
ani-skip for being annoying enough to use that I went and made this.
manami's anime-offline-database which is used to link titles to MyAnimeList IDs.
Taiga's anime-relations used to resolve continuous numbering schemes to their respective seasons.