Apple developer notes on video format for iPod, Apple TV and iPhone

I have been doing a bit of searching on information for converting video for the Apple TV and came across this web-page which contains technical information of converting video for the iPod, Apple TV and iPhone.
If you are after information on bitrates, b-frames, levels, profiles, low-complexity, etc. then this may help:
http://developer.apple.com/technotes/tn2007/tn2188.html
What is interesting to note, whilst 5Mbps is the maximum bitrate, the Apple TV supports spikes up to 12Mbps.
Happy reading and please feel free to add more links to useful information on the video format for the Apple TV.

I have downloaded the Harry Potter and the Order of the Phoenix - Trailer #2 .mov file and this streams quite happily on the Apple TV. This has a total bitrate of 6505Kbps and an audio bitrate of 192Kbps @ 48KHz and video 23.98fps @ 1280x544.
So, according to the Apple TV spec., the audio is well above 160Kbps and the video bitrate is well above 5Mbps. So why does it play at all on the Apple TV let alone stream without stuttering? Maybe its because the video height is 544 rather than the full 720, but why does the Apple TV get to see it?
I don't know the answers, just offering this as an example of a video that is freely available for anyone to try out which clearly exceeds some of the maximum specs for the Apple TV.
Has anyone found or got anything that beats this?

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