i.ytimg.com/vi/_u09lFsIEHA/sddefault.jpg

All about Thumbnail Images as ytimg maxresdefault especially in Search

php - How do I get a video thumbnail from the API? - Stack Overflow

API — getting video thumbnail · GitHub

get-thumbnail option gives url to broken images. · Issue #402 · yt-dlp/yt-dlp · GitHub

Download Thumbnail – Thumbnail Downloader

Image Thumbnail URLs - Brian Prom Blog

i.ytimg.com/vi/dIV9H1_CCk0/sddefault.jpg, scary face move

Get Thumbnail with Youthumb

Get Thumbnail with Youthumb