EBU R128 loudness measurement, normalization, and CI gate.

Measure integrated loudness, range, and true peak, then run deterministic two-pass FFmpeg normalization.

• A deterministic domain analysis engine with explicit scope
• JSON API and responsive local browser workbench
• CLI demo and file-driven analysis
• Docker image, unit tests, and GitHub Actions matrix
• No API keys and no uploaded user data

python -m venv .venv && source .venv/bin/activate
python -m pip install -e .
loudnessgate demo
loudnessgate normalize input.wav mastered.wav --profile podcast
loudnessgate serve

Open http://127.0.0.1:8090. Analyze your own JSON input with loudnessgate analyze input.json.

• GET /api/demo returns the committed fixture and result.
• POST /api/analyze runs the same engine on a JSON body.

• EBU R128
• FFmpeg loudnorm

The podcast fixture measures -18.40 LUFS against a -16 LUFS target, so the gate requests +2.40 dB while its loudness range and true peak already pass. The integration test performs real two-pass normalization and remeasures the output.

Broadcast, podcast, and music-streaming presets are engineering defaults, not universal delivery contracts. Confirm each distributor's current target, channel layout, codec, and true-peak requirements.

python -m unittest discover -s tests -v

MIT licensed.