Slice 20 — Loudness normalization + per-clip gain overrides#51
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Analyze audio RMS to -18 dBFS target, cache offsets in loudnessCache, and apply effective gain in playback while manual clip gainDb overrides auto normalization. Closes #47 Co-authored-by: Cursor <cursoragent@cursor.com>
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Summary
audio-analysismodule: RMS-based normalization to -18 dBFS with peak limiting.loudnessCacheinslideshow.json(filename + byteLength) avoids re-analysis when file unchanged.resolveEffectiveGainDb: manual clipgainDboverrides cached auto offset in playback/export.Test plan
pnpm test— 244 tests passpnpm lint&&pnpm buildloudnessCachepreserved, no re-analysisCloses #47
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