I agree after seeing the patent , there’s nothing groundbreaking or novel there.
Replace video for audio then there’s already prior art for both control and synchronization with Sonos (2005). And a plethora of Winamp web interface plugins.
For video there was already the XMBC web interface. Sure there was no “app”, but the patent is vague enough that the web-browser on the smartphone accessing the web interface can be considered the app