Video thumbnail setting


I found out how to set the video thumbnail here:  Video thumbnail images (very helpful!). My question is, will changing the setting only apply to new videos, or will it affect existing videos as well? Also is 0 seconds a valid entry or is 1 second the minimum?



Added extra question.
[edited by: Oliver Beirne at 3:19 PM (GMT 0) on Fri, Oct 21 2022]
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