I think the Grateful Dead got it right.
Only took me a couple hours to figure out how to embed video in WordPress. The key is to modify the youtube imbedded link. For instance, “../www.youtube.com/embed/WninWFtO0Gg” is modified to “../www.youtube.com/Watch?v=WninWFtO0Gg”
The size is set under WordPress administrative.setting.media.