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Originally Posted by
GregAlexander 
I'm worried about what we've seen.
Is there any evidence that the original phone call was ever disconnected?
I mean - in "FaceTime" - is the audio routed through the regular cell network, while the video goes through wifi? They could add a small delay to audio to match video, and get great audio quality via the cell network while adding video to whatever quality is possible. It bypasses any problems with home QoS setups etc.
BUT... it means that instead of calling my parents for 20 minutes on a landline or Skype, I am actually using my mobile phone minutes. That is a show stopper.
On the other hand - if it uses it to make the connection and then drops the cell call entirely, it's a nice way to have guaranteed connections to whoever I'm calling, and switch to no-charge if we're both on wifi. We don't even need video.
The demo video of FaceTime has disclaimer text stating iPhone 4 and WiFi required. It makes no mention of cellular. That tells me that the audio is, in fact, over WiFi, too.
I can't wait to get this technology dissected. Very happy that it's open source.
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edit:
Asked another way - I don't have access to the keynote stream - when the video was choppy due to the wifi problems, did the audio ever miss a beat?
I don't recall if that always happened, but I know it has happened.
That does not mean they have use audio and video combined into the same stream. They could be separate streams with any drops allowing them to automatically sync up with time stamps based on what I read from the protocols being used.