Removing black borders 4:3 on youtube thumbnails

Question

E.g. I have a link

http://img.youtube.com/vi/aOPGepdbfpo/0.jpg

for a youtube video thumbnail:

Answer 1

How youtube do it. There's lot of parameter in the image url.

https://i.ytimg.com/vi/XkOpbLBzPsY/hqdefault.jpg?custom=true&w=196&h=110&stc=true&jpg444=true&jpgq=90&sp=68&sigh=Gv-oyTIgA39e7UG01pZ2RiGbwSo