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Originally Posted by mariner
1. If direct from aac to ac3, 5ms silence seems to be inserted. This appears to agree with ffmpeg. Audacity is used for comparing the two.
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This is the default behaviour for ALL ac3 encoders.
BTW, with Aften, you can avoid the insertion of 5 ms of silence with, for instance:
eac3to INPUT stdout.wav | Aften -b 192
-pad 0 -readtoeof 1 - OUTPUT.ac3
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2. If going from ts/mkv to ac3, Nero Audio Decoder would be used. This would seem to remove 42ms if the audio begins with silence. So the resulting ac3 would be either -37ms shorter or +5ms longer, depending on the initial content.
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Seems you have misunderstand my post. I say:
"The
directshow Nero 7 decoder, used by eac3to to decode .aac, cut the first 1024 samples (21,333 ms in 48 KHz) in 2.0"
Then,
always cut 21 ms, and (without -pad 0) finish with 16 ms shorter.
The Nero Audio Decoder (NeroAacDec.exe) is not used by eac3to at all.
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Is there a way not to use Nero for step 2?
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eac3to only can decode aac with the directshow Nero 7 decoder.