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Old 30th July 2011, 23:18   #3  |  Link
IanB
Avisynth Developer
 
Join Date: Jan 2003
Location: Melbourne, Australia
Posts: 3,167
You need to compare apples with apples.

You don't say what the original AC3 files are. Most commercial AC3 encodings are very generous bit-rate wise, so there is lots of fat for neroaacenc to trim, hence a high apparent efficiency in your trancode.

I think what you are actually measuring is how efficiently compressed the original AC3's were. If the original bit-rate was over generous then you get a big win. If the original bit-rate was a little squeezed then then you gain less.
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