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Old 5th August 2011, 23:47   #19  |  Link
IanB
Avisynth Developer
 
Join Date: Jan 2003
Location: Melbourne, Australia
Posts: 3,167
Another element to my discussion above is the different psycho-acoustic models used by the various lossy compressions. From what hello_hello seems to be saying, it seems that AC3 compression first makes AAC compression less effective. This would seem to indicate that the 2 psycho-acoustic models are fighting each other. But remember the DTS is also a lossy compression, just not very much. It is hard to make genuine comparisons. Sources from a DVD or BD will all have been individually compressed from an original lossless master.

So in posts above we have :-
  • Master -> DTS -> AAC
  • Master -> AC3 -> AAC
  • Master -> DTS -> AC3 -> AAC
What we need is
  • Master -> AAC
Also we do not know the DTS or AC3 encoders or the settings used to create the commercial media.
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