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Please forget old and discontinued programs like BeSweet, AacDECdrop or TranzGUI.
Also forget the internal channel order in compressed formats.
An AAC decoder, like FAAD2v2.7, output uncompressed WAV files with the correct mapping (FL FR FC LFE SL SR)
An AC3 encoder like Aften (used by WAV to AC3 Encode) need a correct (FL FR FC LFE SL SR) uncompressed WAV file like input.
You don't need know the internal AAC or AC3 channel order.
To recode AAC to AC3 you can use several methods:
1) Command line.
You need a decoder like FAAD2v2.7 and a encoder like Aften with this command:
Faad -w input.aac | Aften -readtoeof 1 - output.ac3
2) Foobar2000.
You need define Aften like external encoder and after load the aac and right clik -> Convert
3) AviSynth methods (SoundOut, Wavi, MeGUI, BeHappy).
You need the Bass libraries to decode and Aften to encode
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BeHappy, AviSynth audio transcoder.
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