{
  "method": "Decode original channels with ffmpeg, no downmix and no sample-rate change; no new ASR calls",
  "sources": [
    {
      "name": "1.flac",
      "sample_rate": "44100",
      "channels": 2,
      "channel_layout": "stereo",
      "peak_per_channel_dbfs": [
        0.0,
        0.0
      ],
      "rms_per_channel_dbfs": [
        -19.447663014967457,
        -20.08938713590886
      ]
    },
    {
      "name": "2.flac",
      "sample_rate": "44100",
      "channels": 2,
      "channel_layout": "stereo",
      "peak_per_channel_dbfs": [
        0.0,
        0.0
      ],
      "rms_per_channel_dbfs": [
        -18.087856327678193,
        -18.311736934079292
      ]
    }
  ],
  "existing_original_metrics_label": "Historical original_metrics in manifest is FFmpeg mono downmix at original rate, not original per-channel metrics. Source files and all tested signals unchanged."
}