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Old 31st July 2011, 19:47   #12  |  Link
b66pak
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Quote:
Originally Posted by sneaker_ger View Post
Very interesting topic you brought up. I'm by no means an expert on audio topics, but I made a very small test:

I created three aac files of a 90 seconds stereo music file using neroaacenc 1.5.4.
1.) just stereo, i.e. two channels
2.) a 5.1 file, with the stereo on front left and front right channels, all other channels (center, LFE, surround) digital silence
3.) a 5.1 file, with the stereo on front and surround left and front and surround right, other channels (center, LFE) digital silence

File sizes:
1.) 1.46 MB
2.) 1.54 MB
3.) 2.94 MB

Sample 3 has almost exactly double the size of sample 1. It seems that neroaacenc doesn't do any "coupling" between front and surround channels, so that would confirm your assumption. I have no idea why sample 2 has more "overhead" from the silent channels, than sample 3.
same test using a 300 sec music encoded with qaac (QT 7.6.9) tvbr 127 and best quality:

1.) 13,160,646 bytes
2.) 13,355,252 bytes
3.) 26,357,495 bytes
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Last edited by b66pak; 2nd August 2011 at 19:21.
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