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verification/tk11343/tk11343-narrated-proof.json

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{
  "duration": "43.666016",
  "narration_pcm_correlation": 0.9999907707958047,
  "audio_length_difference_seconds": 0.016875,
  "format_checks": "PASS",
  "four_full_decodes": "PASS",
  "voice": "macOS Samantha, free local synthesis of exact new narration",
  "limitation": "word-level caption timing remains the existing proportional timing; paid production voice and channel impact not tested"
}