Playing movies encoded in AAC 6 multichannel gets only single PCM track?

So,
I have connected the new Apple TV to my receiver via HDMI; and have noticed that movies I have encoded and are playing back from my library are playing a single linear PCM track only; rather than either PCM 6 (or less) channels. I would have expected the Apple TV to either convert these to AC3 on the fly; or output straight multichannel PCM from the AAC soundtrack. Is that not the case? That would mean there is no way to output AAC multi encoded video and movies in surround sound?!?
It would appear Apple encodes their HD trailers and other material in 6 channel AAC and these play fine?
Cheers,
dan

The spec is:
20-inch iMac, 2GHz, early 2006
Graphics Card: ATI RadeonX1600
Mac OS X 10.4.11

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