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What does the yellow vertical line signify in the YouTube video timeline?

Is it an ad start point, or is it its you-can-play-now point as many believe?

It's not clickable nor does hovering over it do anything special. What it is there for?


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2 Answers 2

up vote 9 down vote accepted

It marks the point when an ad pops up in the player.

Here is the marker visible in a video:

YouTube - Yellow Marker No Ad

And here is the popup advert when the player reaches the marker:

YouTube - Yellow Marker Popup Ad visible

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+1 for unicorns –  neo Jul 6 '11 at 18:24
@neo: It's mandatory around these parts of the interwebs! :) –  Barry Jul 6 '11 at 18:25
and freehand circles of course... How can I forget them? –  neo Jul 6 '11 at 18:30

I have watched videos that have the yellow line(s) in the progress bar but! don't pop up ads. One video like this had the yellow lines marking each track on an album (this video was of a full album). So! This cannot be just for advertisements. I must research more thoroughly and find the Truth!

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How does this answer the question? –  Al E. Nov 2 '14 at 15:16

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