If you are using your iOS device to Airplay to the Apple TV, then the video is already compatible with the Apple TV. Not sure what you are saying here. There is no video that can be played on an iPhone 4 or iPad that cannot be played on the Apple TV. And if an app like Plex or Air Video converts video on the fly to be able to be played on your iPhone, what exactly makes you think that same converted (and now compatible) video won't be able to be played through the Apple TV with Airplay? You are missing the fact that if you are sending content through Airplay it is inherently compatible with the Apple TV. If the content is not compatible, you would never even be able to play it on your iOS device and never get the Airplay controls...
What you say is mostly true. However, just arguing that it will work because AirPlay is enabled doesn't prove that just any app WILL work (what I mean is that if the app or video stream is not compatible with AirPlay -- for whatever reason -- then it won't play). Also, it isn't true that there, "is no video that can be played on an iPhone 4 or iPad that cannot be played on the Apple TV." The VLC app for iOS handles video formats that are not normally native to the iOS.
newagemac said:
Ok I just went back and reread your post and maybe you weren't aware that Plex converts video on the fly to a compatible format just like Air Video.
True, I wasn't certain whether Plex on the Mac offered transcoding. However, I specifically allowed for that possibility in my original post where I said, "unless Plex transcodes the video into H.264 (or some other Apple TV compatible format) you won't be able to use Plex to stream content over AirPlay." Thus, since the Plex application/server on the Mac does transcode to H.264 there is a possibility that it will work with AirPlay.
newagemac said:
I don't see how this would be a problem [a "double hop"]. As far as your iPhone or iPad is concerned, all it sees is a compatible video stream coming from the Air Video or Plex Server on your Mac. That's not much different than a stream...over the web with Safari...
You may be correct. However, until someone is able to use Plex or StreamToMe or some other video transcoding server that runs on the Mac we won't know for sure. For example, I believe that AirPlay will only work in apps that are using the iOS-standard video player UI. Of course, with iOS's object frameworks it would be possible to change the appearance and behavior of the standard player without affecting AirPlay compatibility but it's also possible that certain code overrides would break or disable AirPlay.
Lastly, I'm of the opinion that certain apps will either block or be incompatible with AirPlay. Plex, AirVideo, and StreamToMe would have no reason to block content but I'm pretty confident that so-called premium content players like the ABC app and Hulu Plus will block AirPlay streaming to the Apple TV.
In any case, I'm really looking forward to getting AirPlay on the Apple TV. In some respects, this could make or break the Apple TV, at least until (or if) native apps come to the product.