i.ytimg.com/vi/YfZu56HPLw8/maxresdefault.jpg

i.ytimg.com/vi/T3JLx3qmQkw/maxresdefault.jpg, grab pack

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

i.ytimg.com/vi/T3JLx3qmQkw/maxresdefault.jpg, grab pack

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

Getting all the video thumbnails from a video