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AAC "Low Complexity" question
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Forum Regular
Join Date: Mar 1999
Location: Orlando, Florida
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Hi. In the info window of an AAC-encoded track in itunes there is a category called "profile" and in the files I make with itunes it is set to "low complexity." Below it is the Stereo/mono setting info, and the encoder information. Anyone know what the complexity is, what it impacts, etc?
Thanks,
J.Melrose
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Last edited by jmelrose; Apr 30, 2003 at 01:20 PM.
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Forum Regular
Join Date: Mar 1999
Location: Orlando, Florida
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Mac Enthusiast
Join Date: Dec 1999
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Offline
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Originally posted by jmelrose:
No one knows?
This blurb can be found in the iTunes Help:
From iTunes Help:
Variable Bit Rate Encoding (VBR): This setting varies the number of bits used to store the music depending on the complexity of the music. This can help keep file size to a minimum.
I guess Complexity is the quality of the sound, i.e if it's Mono-Voice it is not very complex, but if it is a high fidelity stereo surround sound Music Track it's very complex and needs a higher sample rate to catch it all.
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Fresh-Faced Recruit
Join Date: May 2003
Location: France
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In an article called "AAC : life beyond MP3" from Hi-Fi News October 2000 (I found it on the web but don't remember where), they explained that :
"The AAC codec provides for two processing
settings�Low-Complexity Profile (LCP) and Main Profile (MP)�both of which were tested. Main Profile produces superior results but as the instructions accompanying the AAC codec warn: �Please note that all known commercially available (or upcoming) IC implementations of AAC decoding support AAC Low-Complexity Profile only.�"
I hope it helps
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