How to create video embeds (YouTube, Vimeo) that fill the entire column? 

I can scale the entire video up and down, but after a certain max width or height, only the container scales and the video stays rather small. I see the same both on my site and on the IPS preview installation. 

In System->Settings->Posting & Editor, check the "Maximum embedded content width" setting

That is set to unlimited. But picking a large value also doesn’t seem to change anything. 

What browser are you using?

 

In System->Settings->Posting & Editor, check the "Maximum embedded content width" setting

Maximum embedded content width has a bug, embed size doesn't update properly when that settings is set. Fix should come in next release I think.