detect-loudness-issueslisted

# Detect Loudness Issues / 响度问题检测 ## When to use / 何时使用 Right before encoding. Avoids platform auto-normalization surprises. 编码前。避免平台自动归一造成的响度变化。 ## Inputs / 输入 - `workspace/audio/master.wav` (or final muxed mp4 audio). - `--target` youtube | bilibili | broadcast. ## Output / 输出 - `workspace/qc/loudness.report.json`: `{integrated_lufs, true_peak_db, lra, verdict}`. ## Steps / 步骤 1. Run `ffmpeg -af loudnorm=...print_format=json` in measurement mode. 2. Compare to target spec (yt: -14 to -16 LUFS, TP ≤ -1 dB). 3. Emit verdict and remediation hint. ## Examples / 示例 ``` ffmpeg -i master.wav -af loudnorm=print_format=json -f null - ``` ## Failure recovery / 失败回退 - If outside target, recommend re-running mix-audio with corrected target. - If TP > -1, suggest a limiter pass.