That's video previews. Our Help Center resource has detailed info: https://goo.gl/hx5uY8 . Hope this helps!
@TeamYouTube Is there a way to add a small 3 second intro to every video on a channel? Am i overlooking a certain option or has that disappeared in recent years?
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I found that one. Its not possible to create your own intro anymore? A short clip which can be added also to clips shorter dan 30 secondes.
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