Since I have a Chromecast I'm thinking about getting a movie or TV show on Google Play Movies. I have an HD TV, obviously, but my phone and tablet don't support HD playback. If I cast to my Chromecast from my non-HD phone or tablet and I have purchased the HD version of the movie, will the Chromecast stream the HD or SD version? For that matter, can I even start up the HD version on my non-HD phone to cast it? I don't have a computer in the same room as my Chromecast so I'd rather not have to do it from within Chrome. Any experiences?