and how the frak can I change the video size? This is so not html
Size is fixed. I suppose we could modify the tag to include a height and/or width parameter but - why? It's large enough to see well when played embedded and I fixed the issue of not being able to full screen it early last year. Do you think it's too big as embedded by default (I made the embed size larger when I fixed the full screen control)?
You can also simply just paste the video watch URL straight into the editor window and upon posting it will embed it in a media tag for you