Feature: optional video thumbnail that is collage of four images

This feature request is to provide an option in the preferences of Nautilus that a thumbnail of a video is a collage of four images taken from 20%, 40%, 60% and 80% of the timeline.

Illustration of the idea is Imgur: The magic of the Internet

Benefit for the user is more easily differentiate between very similar videos. This could be because the setting or generation is very similar, e.g. recordings from a security camera. When going through dozens of videos like this, this thumbnail can drastically reduce the time the user needs to find a specific video.

Video thumbnails are currently generated by Totem.