i.ytimg.com/vi/_HYhAc_bPgk/hqdefault.jpg?sqp=-oaym

php - How do I get a video thumbnail from the API

php - How do I get a video thumbnail from the API

How to get HQ thumbnails? - Stack Overflow

All about Thumbnail Images as ytimg maxresdefault

thumbnail has different resolutions after subsequents API

php - How do I get a video thumbnail from the API

get-thumbnail option gives url to broken images. · Issue #402

Get Thumbnail with Youthumb

All about Thumbnail Images as ytimg maxresdefault especially in Search

thumbnail grabber - Boing Boing