download video from YouTube:

Add to YouTube link "ss" before word "youtube".
So: becomes

Flag Youtube video as inappropriate => Select reason => Spam => misleading thumbnail:

YouTube video with high quality

240p: &vq=small 
360p: &vq=medium 
480p: &vq=large 
720p: &vq=hd720 

YouTube video with autoplay

YouTube video with loop

YouTube video with time param

YouTube video with other params

YouTube thumbnails

Each YouTube video has 4 generated images. They are predictably formatted as follows:

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:<insert-youtube-video-id-here>/default.jpg

For the high quality version of the thumbnail use a url similar to this:<insert-youtube-video-id-here>/hqdefault.jpg

There is also a medium quality version of the thumbnail, using a url similar to the HQ:<insert-youtube-video-id-here>/mqdefault.jpg

For the maximum resolution version of the thumbnail use a url similar to this:<insert-youtube-video-id-here>/maxresdefault.jpg

All of the above urls are available over https too. Just change http to https in any of the above urls.

Video example:

Thumbnails from video:

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