Events for video playbak

I have a program in the Mac App Store, Remotely Quiet, that mutes your mac when a remote call is made. I have made a few scripts and programs that can be used with the program that makes the mute calls at the correct times. Some examples are, when the phone rings on the Android or iPhone, when video starts playing in mythTV. I would like to also create a solution for Roku, but after looking through the APIs I don't see any event that fires when video/audio playback starts and stops, at least not on a global scale. I can do it in my own channel but is there anyway to detect when other "channels" start playing.

For example I would like to make the remote call when starting to watch a Netflix video.

Any tips would be great, thought it might not be possible.