Does anybody know how they got the little yellow lines indicating "chapters" in this YouTube video?
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As mentioned in the comments, those chapter markers aren't chapter markers but ad break markers. Ad breaks are only available on videos longer than 10 minutes, and can be placed either automatically or manually.
Putting ads in places where a new chapter or sequence begins makes sense of course (as opposed to putting one mid-sentence), so those ad-markers do double as chapter markers as well.