i.ytimg.com/vi/RrvqA6bDYEs/maxresdefault.jpg

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

php - Fetch highest thumbnail resolution - Stack Overflow

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

How to get HQ thumbnails? - Stack Overflow

Osram cool blue intense w5w

Getting all the video thumbnails from a video

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