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Does anybody know how they got the little yellow lines indicating "chapters" in this YouTube video?

chapter markers in YouTube

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    Those are ad breaks and they're automatic (for YouTube partners). – Shahar Aug 27 '14 at 14:54
  • Uh I guess they are and only because of how the show is structured with it's commercials, they coincide with the different chapters... I suppose there are no ads playing for me b/c of AdBlock? – olli Aug 28 '14 at 0:18
  • Then maybe Youtube Partners can choose when they want their ads, but it's automatic (every X intervals) if you just upload the video. And yeah, it's ads, you don't see them because of AdBlock. – Shahar Aug 28 '14 at 0:21
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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.

See also: Manage ad breaks in long videos - YouTube Help

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While those are indeed ad break markers in the screenshot of the question, the answer is:

You can create chapter markers for a YouTube video by adding timestamps and some verbiage to the video description.

Take this video for example: https://www.youtube.com/watch?v=ckYN_TwbGiQ&t=194s

You can see that the play bar is broken up into segments, each segment being functionally equivalent to a chapter.

Example of chapter markers in a YouTube video

Below, in the description, are the aforementioned timestamps. The format is

[h:m:s] Freeform text[CRLF]

wherein h:m:s is hours, minutes, and seconds. Hours may be omitted if the timestamp is less than one hour into the video, and the hours and minutes may or may not be zero-padded, at your preference.

For example, this video description should create chapter markers in a hypothetical 10 minute video:

This is my awesome video, please comment and share!

0:00 Intro
1:45 Meet my Cat
5:22 I Eat Spaghetti
9:32 Time for Swimming or Whatever

Note that in the example pictured, the text Video Markers; appears atop the list of chapters. That's not necessary, and nothing need precede the list.

(This is poorly documented, and not used very often. It worked on the video pictured and I verified all of this using a video on my YouTube account. I can't guarantee that it will work on all accounts, and YouTube has a tendency to dole out features depending upon account status.)

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