Thanks for reaching out. Ad placement & timing is determined by the creator. Please let the channel know directly if you're seeing too many ads. You can improve your ad recommendations here: https://goo.gl/ZB1qVL . Hope this helps.
@YouTube @TeamYouTube I had a 4 minutes un-skippable ad today. Plus I get random 2 seconds ads which just says "youtube".Why would you advertise your own website on your website? In the middle of my video, "Youtube" ad pops up. whats up? not angry or anything, just curious. 
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Thanks. Twitter will use this to make your timeline better. UndoUndo
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