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Can HE-AAC be losslessly transcoded to LC-AAC?, [TOS #6: moved from General Audio, was “HE-AAC to AAC transcode”]
post Jan 7 2013, 08:57
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I was wondering if it was possible to transcode losslessly from HE-AAC to AAC. I have a peace of HE-AAC audio which I would like to listen to on a HE-AAC incompatible hardware. My understanding of HE-AAC being it's roughly AAC LC with SBR to gain over bitrate, I thought it might be possible to reconstruct the 48KHz symmetric AAC frame without loss. Would anyone here know if it is possible ?
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post Jan 9 2013, 17:10
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HE-AAC consists of a 22kHz LC-AAC file, with some extra info (the HE part) on how to best guess the upper 22kHz from the LC part.

Non-HE-AAC players will see and play the 22kHz LC-AAC part and simply not do the extra reconstruction.

"Lossless transcoding" is a bit of a strange concept in there.
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