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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 7 2013, 10:16
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I think it's likely that your hardware can play HE-AAC file as LC-AAC if it is implicitly signaled.
If your hardware supports ADTS playback, try it first.
If not, try remuxing like the following:
mp4box -raw input.m4a && mp4box -add input_track1.aac -new output.m4a
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