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Originally Posted by iSeries
Hi, I was under the impression that when converting a 7.1 track to 5.1, eac3to would automatically run a second pass and reduce the volume if clipping was detected.
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Correct.
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So I just ran this conversion and eac3to didn't generate a second pass. As a test, I ran the same command with -normalize added, and eac3to applied a -0.09db gain, so in other words, there was clipping.
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A -0.09db gain can be considered like clipping, because LigH is right when say:
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Originally Posted by LigH
In this case, I guess a conservative fixed downmix gain was used. Ensures no clipping, but may not utilize the whole amplitude range.
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So am I supposed to add -normalize to every 7.1 to 5.1 downmix?
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Is not recommended.
Even, if the automatic normalize show a big attenuation value, you can consider use a special downmix (MeGUI or BeHappy) than preserve volume in FL,FR,FC and LFE, and only apply attenuation to mix SL+BL, SR+BR.