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

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

i.ytimg.com/vi/IXkBd4Ne5n4/maxresdefault.jpg?sqp=

thumbnails extractor

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

maxresdefault thumbnail · Issue #373 · nullscreen/yt · GitHub

i.ytimg.com/vi/IXkBd4Ne5n4/maxresdefault.jpg?sqp=

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