How to (nearly) automatically find loop points in any song

This guide is primarily (but not exclusively) meant to complement my Initial D Arcade Stage Zero and Initial D The Arcade (and IDAS4-8 SOON™) music modding guides (and for Criware audio modding in general) but will work for any purpose.

IDAS0 and DAC-specific

Cutting up your tracks to match or slightly undercut the originals is a necessity for IDAS4 through 8 but after some testing it SEEMINGLY isn't required for IDAS0 and DAC. If your songs stop playing mid-race then go ahead and follow this guide to set up loop points before converting them to HCA.

What you need
Installing PyMusicLooper
Using PyMusicLooper

What you need

PyMusicLooper

Optional:

Python (64-bit) >=3.10
- pip or pipx (but frankly pip is perfectly fine)
ffmpeg or pip install ffmpeg
Audacity or Tenacity

Installing PyMusicLooper

Download a precompiled version of PyMusicLooper
OR
Open a terminal window and run pip install pymusiclooper (or pipx)

Using PyMusicLooper

Prepare your track(s) as needed (you're required to match or undercut the originals' length for IDAS4-8) in a folder.
Open a command prompt window and run either pymusiclooper (or <path to pymusiclooper.exe> if you downloaded the precompiled one) -i -s tag --path "audio folder path" --tag-names LOOP_START LOOP_END if you want to export the loop points to a copy of the files (I've asked the maintainer to add an option to write the tags to the original files instead just to save space) or -i -s export-points --path "audio folder path" --export-to txt if you want to save them to a .txt file.
Let PyMusicLooper process the files. It will then present a table for each song with a bunch of values: ideally you want to pick the one with the biggest length value whose Score is as close to 100% as possible. You can preview the loop by typing the number and adding a p without spaces.

The preview starts from the Loop Start value. I've asked the maintainer to add the option to start the preview a few seconds before the Loop End instead just like how Audio Cue Editor does it. In the meantime you can use Audacity or its forks to preview the loop much quicker. Simply load the track, switch the view to samples (right-click the selection boxes under "Start and End of Selection") and input the selection start/end values manually (you can't copypaste them) and start the playback near the end by shift-clicking on the bar with the timestamps above the waveform (you should see a green blip when the cursor is hovering over that area)

After you're done you'll either have new files with embedded loop points or a .txt with loop points you'll be able to plug into VGAudio.