What is this graph like object above the bar that shows where in the video you are?

1. 2017-07-20 at 12:40 AM UTC

   #1
   The Self Taught Man Black Hole
   [video]https://www.pornhub.com/view_video.php?viewkey=ph57a134a27bf28[/video]
   
   **sigh**
   
   https://www.pornhub.com/view_video.php?viewkey=ph57a134a27bf28
2. 2017-07-20 at 4:08 AM UTC

   #2
   

   Lanny Bird of Courage
   I assume it's like the volume of viewership that segment got
3. 2017-07-20 at 7:15 PM UTC

   #3
   The Self Taught Man Black Hole

   Originally posted by Lanny I assume it's like the volume of viewership that segment got

   
   That's what I thought at first too, but that's why I chose this video as an example. It's pretty low for the whole video but then spikes at a random spot that just shows the girls face. It doesn't really seem like those 5 seconds would be the most popular part of the video to me. Other ones on other videos have similar anomalies.