Each YouTube video has 4 generated images, like: http://img.youtube.com/vi//0.jpg http://img.youtube.com/vi//1.jpg http://img.youtube.com/vi//2.jpg http://img.youtube.com/vi//3.jpg The first one in the list is a full size image and others are thumbnail images. The default thumbnail image (ie. one of 1.jpg, 2.jpg, 3.jpg) is: http://img.youtube.com/vi//default.jpg For the high quality version of the