Apple Trailers and 5.1 Audio Channels - Two Channels Substituted For Six?

Hi there,

Not a huge technical question, as this is more of a personal inquiry. Last year, when HD trailers would release on Apple's trailer page, the trailers contained six channels of audio, creating a surround sound experience. Through Quicktime, one could inspect the audio elements of the trailer, and extract specific channels. For instance, if I wanted to listen to the voice overs without the music, I could just extract the center track from the trailer.

Lately, I've noticed that every trailer I download is encoded in stereo, containing only left and right channels. Instead of the six channels that once existed, there are now only two. Thus, I don't have the freedom that Quicktime once allowed in terms of separating channels, listening to isolated bits, etc., not to mention that the trailers are no longer true 5.1 surround sound.

Has anyone else noticed this? Is it a technical problem on my end, or has Apple stopped receiving/releasing trailers with six channel audio encoding?

Any information on the topic would be most appreciated.

Thanks in advance,

Corey