The StageVideo article for you

If you are developing applications for AIR 2.5 for TV or for Flash Player 10.1 Beta for GoogleTV, be sure to visit this Adobe Developer Connection article to learn about using the StageVideo class:

Delivering video and content for the Flash Platform on TV

But if you are developing applications for Flash Player 10.2 Beta, see this article instead:

Getting started with stage video

The main difference is in the events that get dispatched. Flash Player 10.2 Beta provides the StageVideoAvailabilityEvent, the StageVideoEvent, and the VideoEvent.
AIR 2.5 for TV and Flash Player 10.1 Beta for GoogleTV dispatch only the StageVideoEvent.