just to share in picture format
you copy the link from youtube the https link.
You click on the embed video button
it comes out as a link instead
so you need to delete the "s" from https
and that's it
you go to edit your post the link doesn't show like this
[video]http://url of yt video[/video]
nothing wrong with this just that sometimes some people unaware of this might click on the quote post of an embedded video and try to copy the format which is more complicated than just removing the s before embedding the video.
That's it just showing some of you how the forum changes the wording once it's posted.
EDIT: i just tested it by embedding the https link on yt and it embeds now. so disregard my above posting but if you edit your post it changes the wording of the embed