Did you know about YouTube's extended thumbnails? They are like frames from various parts of the video. That and storyboard images are partly revealed by .info.json from yt-dlp; example:
https://ipfs.io/ipfs/bafybeibxwrlyztdyzwscz2w6gt2hdwozghn3ypyseephh7yd6fcwc2wjiy/youtube-FK6hk05naKA/PMV_Nightcore_numa_numa-Bunnybun_chan-20121111-youtube-854x480-FK6hk05naKA.info.json

 >>/9008/
> yt-dlp
First thing I tried, didn't work, no extractor, same story with movie-web.app

pfp from npr
> https://web.archive.org/web/20231210060536/https://yt.oelrichsgarcia.de/watch?v=RVIe2hwysW0&nojs=1 "Justice - Ohio (Official Audio)"
user who made that comment (of interest to me) does have some MLP-related videos in his channel