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25th February 2021, 21:18 | #1 | Link |
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Too much gain with normalization.
I use normalize in encoding bluray DTS and AC3 to AAC. Don't know if I should do it or not but it always worked without sounding bad.
Recently I did a source and the gain is too high and the resulted audio quality is not too good. Please look at these and the graphs and tell if the normalization is done correctly. Why this happened and why it sounds bad? I never had this much difference after normalization. command line: eac3to.exe audio.ac3 audio.m4a" -quality=0.4 -normalize -progressnumbers ------------------------------------------------------------------------------ AC3, 2.0 channels, 2:45:58, 192kbps, 48kHz, dialnorm: -27dB Removing AC3 dialog normalization... Decoding with libav/ffmpeg... Writing WAV... Creating file ...wav"... Caution: The WAV file is bigger than 4GB. <WARNING> Some WAV readers might not be able to handle this file correctly. <WARNING> Starting 2nd pass... Reading WAV... Reducing depth from 64 to 32 bits... Encoding AAC <0.40> with NeroAacEnc... Applying 6.9dB gain... Original audio track: max 32 bits, average 30 bits, most common 31 bits. The processed audio track has a constant bit depth of 32 bits. eac3to processing took 8 minutes, 25 seconds. Done. Before After |
26th February 2021, 00:48 | #2 | Link | ||
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Quote:
We can see than frequencies over 16 KHz are discarded because you use a 0.4 quality (use more quality if you want preserve high frequencies, but for my old ears is enough, I can't listen over 12 KHz). The normalization is correct: Quote:
Maybe the source is not good already.
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26th February 2021, 10:12 | #4 | Link |
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Normalization affects the volume of the audio, not the quality. If the original audio quality is good, but it is too quiet, than the aac encoder is likely the culprit. There are a number of aac encoders available and they were not created equal, some are good, others are cr4p!
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26th February 2021, 12:07 | #5 | Link | |
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Quote:
Peak normalization can be useful after downmixing, for example. |
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