In accordance with YouTube 's loudness normalization specification, an option to optimize sound pressure has been added to AI Mastering's custom mastering.
"Target sound pressure mode" option
Specify the reference calculation method of the target sound pressure.
Loudness (conventional operation)
Limits the loudness defined by ITU-R BS.1770 to match the target sound pressure. It is the same behavior as before.
Limit so that the approximate value of loudness used in YouTube loudness normalization matches the target sound pressure. Approximate formulas are based on the YouTube loudness normalization algorithm survey .
According to the survey, since the reference value of the loudness normalization is -10.3 dB, considering that the actual sound pressure slightly decreases from the target sound pressure, if the target sound pressure is set to about -9 dB, the loudness normalization does not work or it does not work You can set it to the very last sound pressure.
How to optimize loudness for YouTube?
Together with the "Ceiling" option added here , mastering with the settings below, you can perform mastering optimized for YouTube.
"Target sound pressure mode": "YouTube loudness"
"Target sound pressure": "-9 dB"
"Ceiling mode": "True Peak (15 kHz Lowpass)"
"Ceiling": "-0.5 dB"
※ The YouTube loudness normalization reference value is -10.3 dB and the target sound pressure is -9 dB because the actual sound pressure slightly drops from the target sound pressure.
How to make it operate like a conventional one?
If you make the following settings, the conventional operation will be performed.
"Target sound pressure standard": "Loudness"