i.ytimg.com/vi/UpW6xnCNUZE/maxresdefault.jpg

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

thumbnails extractor

All about Thumbnail Images as ytimg maxresdefault especially in Search

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