MLB.tv added Chromecast support for its iOS and Android apps on Thursday, giving baseball fans yet another way to stream America’s favorite pastime to their televisions. As always, live streaming requires a $129.99 MLB.tv premium subscription and in-market games are blacked out. Previously, you could mirror the MLB.tv website from a Chrome tab, but having the option to cast from an app usually improves video quality on Chromecast.Related research and analysis from Gigaom Research:Subscriber content.