I tested the file 7.1 DTS -> 2.0 AAC. The sound is normal.
When make DTS 7.1 -> AAC multichannel, the sound is wrong. In future versions I will add a decrease to 5.1. This is one option for Eac3To (-down6).
log:
Code:
Started processing file: D:/Video/dts71/file7_1.dts
Copy file D:/Video/dts71/file7_1.dts to Temp\file7_1_internal_audio_0.DTS
Starting Eac3To with the parameters:
Tools\eac3to\eac3to "D:/Download/MkvToMp4/0.217/Temp/file7_1_internal_audio_0.DTS" "Temp\file7_1_internal_audio_0.wav" -down2 -normalize -down16 -progressnumbers
DTS Master Audio, 7.1 channels, 16 bits, 48kHz
(core: DTS, 5.1 channels, 16 bits, 1509kbps, 48kHz)
Decoding with ArcSoft DTS Decoder...
Mixing surround channels...
Downmixing multi channel audio to stereo...
Reducing depth from 64 to 16 bits...
Writing WAV...
Creating file "Temp\file7_1_internal_audio_0.pass1.wav"...
Clipping detected, a 2nd pass will be necessary.
The original audio track has a constant bit depth of 16 bits.
Starting 2nd pass...
Reading WAV...
Reducing depth from 64 to 16 bits...
Writing WAV...
Applying -2,99dB gain...
Creating file "Temp\file7_1_internal_audio_0.wav"...
Done.
Starting Qaac with the parameters:
Tools\qaac\qaac --tvbr 95 "D:/Download/MkvToMp4/0.217/Temp/file7_1_internal_audio_0.wav" -o "Temp\file7_1_internal_audio_0.m4a"
initializing QTML...done
qaac 0.86, QuickTime 7.7.0
file7_1_internal_audio_0.wav