I've got a full page Youtube video embed on a page and recently I've noticed it defaults to low quality. I saw this is a common problem that had different solutions at different points in time so I was wondering if anyone has any new tips?

I've tried setting the width and height of the iframe to 1920x1080 and adding &vq=hd1080 or &vq=hd1080p to the source url but none of these seemed to work.