My question: is there no option then for the url to appear, if I prefer, instead of the video? With infinite scrolling plus WordAds video, I’m not keen on having video comments except in special cases, but I don’t mind links, if they are appropriate.
If you don’t mind the link, and are happy to edit the comment yourself, I think that if you put a space before the link it will stop it being embedded and turn it into a link. They only embed if they have their own line in the comment. (That is how it works on my blog anyway.)