i.ytimg.com/vi/5qYlE6dLB1o/sddefault.jpg

API — getting video thumbnail · GitHub

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

thumbnails extractor

get-thumbnail option gives url to broken images. · Issue #402 · yt-dlp/yt-dlp · GitHub

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

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