Too bad the thing with the scrollbar thumbnail doesn't work with this video (with the clip that loops). In compilations of city pop, synth pop or similar genres on KZbin there's these short looping clips. If you move the mouse over the scrollbar slowly, sometimes you see that clip rolling in the thumbnail, forward or in reverse, or one single frame, or other special behaviours. This is because how the duration of the clip overlaps the space between the thumbnail's frames.