i.ytimg.com/vi/sy3McjRbUzw/maxresdefault.jpg

の動画のサムネイル取得が思った以上に簡単だった件

maxresdefault thumbnails - Stack Overflow

Getting all the video thumbnails from a video

All about Thumbnail Images as ytimg maxresdefault

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

How to get thumbnail images in just 1 click - HANDS ON tek

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

All about Thumbnail Images as ytimg maxresdefault

All about Thumbnail Images as ytimg maxresdefault

thumbnails extractor