Pihole er youtube

D'apres le manuel, pihole ne pas bloquer les premieres pub que l'on a quand on commence a visionner une video.N'y a t-il pas de solutions ?

Not via Pi-hole.

Best solution without hassle is get an ad free YT subscription .
Others are browser add-on's or alternative YT viewers.

Problem is that YT serves the ads from the same domain as where the vids are coming from.
So if you block a YT ad serving domain, chances are that some of the vids wont play either.