i.ytimg.com/vi/BfqeEkZiaUs/maxresdefault.jpg

All about Thumbnail Images as ytimg maxresdefault especially in Search

] Thumbnail download fails completely if maxresdefault.jpg is not available · Issue #21588 · ytdl-org/-dl · GitHub

i.ytimg.com/vi/I4j4OGl_XHQ/maxresdefault.jpg

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