In case you haven't seen it, Sonoma now offers the same videos that were used as screensavers on the Apple TV for use as wallpaper and screensavers. I wrote a free application to download the video wallpapers found in macOS Sonoma. This application should work on older macOSes but the videos may or may not work on older computers/OSes.

Official website:
https://wallpaper-downloader.greggant...


Read the readme, as you'll need to right click to open the app.
https://github.com/fuzzywalrus/sonoma...

This video covers how I was able to make this at a high level so non-developer can follow along and explores some of the basics of how one might go about hacking and experimenting with macOS.

WallGet Live Wallpaper Download/Delete Script for macOS
https://github.com/mikeswanson/WallGet


Every OS X (macOS) 10.6 Snow Leopard Nature Desktop - in Glorious 5k Resolution
https://blog.greggant.com/posts/2021/...

Every OS X Snow Leopard Abstract Desktop - in Glorious 5k and 8k Resolution
https://blog.greggant.com/posts/2021/...

macOS 14.x Sonoma Video Wallpaper location:
/Library/Application Support/com.apple.idleassetsd/Customer/4kSDR240FPS

Reddit Thread on video background replacement:
  / til_that_you_can_use_custom_videos_for_the...