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Loudnorm

Normalize audio loudness to broadcast levels using ffmpeg's two-pass loudnorm filter. Measures the input, then applies normalization with the measured parameters. Use as a final-stage audio leveling step.

jperrello 354efe0 2 files · 3.0 KB Updated
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loudnorm

ffmpeg two-pass loudnorm. Outputs broadcast-safe audio (default targets: I=-14 LUFS, TP=-1.5 dBTP, LRA=11).

Inputs

  • input: video or audio path
  • out: output path
  • I (optional): integrated loudness target, default -14
  • TP (optional): true peak target, default -1.5
  • LRA (optional): loudness range, default 11

Output

Media file with normalized audio. Video stream copied (no re-encode).

How

  1. Measure pass: ffmpeg -i <in> -af loudnorm=I=<I>:TP=<TP>:LRA=<LRA>:print_format=json -f null - → parse the JSON block from stderr.
  2. Apply pass: ffmpeg -i <in> -af loudnorm=I=<I>:TP=<TP>:LRA=<LRA>:measured_I=<>:measured_TP=<>:measured_LRA=<>:measured_thresh=<>:offset=<>:linear=true:print_format=summary -c:v copy <out>.

Status

Stub. Salvageable command construction in archive/pre-pivot:pipeline_v2.py:672-778.

jperrello/C0BALT_CUT/tree/main/.claude/skills/loudnorm commit 354efe004b

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