Interface PreprocessingConfig.AudioOrBuilder (0.70.0)

Specify audio loudness normalization in loudness units relative to full scale (LUFS). Enter a value between -24 and 0 according to the following:

• -24 is the Advanced Television Systems Committee (ATSC A/85)
• -23 is the EU R128 broadcast standard
• -19 is the prior standard for online mono audio
• -18 is the ReplayGain standard
• -16 is the prior standard for stereo audio
• -14 is the new online audio standard recommended by Spotify, as well as Amazon Echo
• 0 disables normalization. The default is 0.

double lufs = 1;