유튜브 썸네일 URL
0. 썸네일 주소 https://img.youtube.com/vi/고유주소/이미지크기.jpg https://i.ytimg.com/vi/고유주소/이미지크기.jpg https://i1.ytimg.com/vi/고유주소/이미지크기.jpg https://i2.ytimg.com/vi/고유주소/이미지크기.jpg https://i3.ytimg.com/vi/고유주소/이미지크기.jpg https://i4.ytimg.com/vi/고유주소/이미지크기.jpg https://s.ytimg.com/vi/고유주소/이미지크기.jpg 1. 고유 주소 https://www.youtube.com/watch?v=mAfznu4wUzQ https://youtu.be/mAfznu4wUzQ https://www.youtube.com/embed/mA..
