Normalize (LUFS)
EBU R128 loudness normalization. Pick a target loudness and get a balanced MP3 output.
Target loudness
One-pass loudnorm
Fast single-pass EBU R128. For absolute precision you can later add two-pass mode.
Clipping safety
True-peak set around −1.5 dB in the filter to avoid inter-sample clipping.
Use cases
−14 LUFS for streaming music, −16 LUFS for podcasts, −18 LUFS for spoken-word content.