What are these dark dots?

What are these dark dots on the time line? Are they necessary?

They divide the timeline into equal segments to denote time and duration.

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And they don't interfere with the skip? And what's the practical purpose for the user?

It has nothing to with seeking. It’s just a visual indicator.

The purpose is to help give you an idea of duration by giving marks for each 15 mins or 30 mins depending on the length of the timeline.