{
  "schema": 1,
  "purpose": "Finite temporal-mean/median low-light visual control for the preserved 2018 YouTube transcode; not a general steganography search.",
  "software": {
    "python": "3.12.13",
    "opencv": "5.0.0",
    "numpy": "2.5.1",
    "pillow": "12.3.0",
    "reproduction": "Install requirements-video-analysis.txt; the temporary local analysis path is optional and not part of the public release."
  },
  "video": {
    "path": "solution/video/i-am-the-method-kQx2G3x7_WQ/i-am-the-method-kQx2G3x7_WQ.mp4",
    "sha256": "0383e479b368c94983e0ce3e25d65e85ccf632f944be2f9258c38c4fc7fa52e4",
    "bytes": 3300017,
    "width": 1920,
    "height": 1080,
    "fps": 29.97002997002997,
    "frames": 4451,
    "duration_seconds": 148.51503333333335
  },
  "sampling": {
    "mean_interval_seconds": 1,
    "mean_frame_count": 149,
    "mean_sample_seconds": [
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    "median_interval_seconds": 10,
    "median_frame_count": 15,
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    ],
    "method": "OpenCV seek-and-decode at exact integer second positions; RGB mean over all 1-second samples and per-pixel RGB median over 10-second samples."
  },
  "derivatives": {
    "temporal_mean": "temporal_mean.png",
    "temporal_median": "temporal_median.png",
    "figure": "temporal-stack-audit.png",
    "fixed_variants": [
      "temporal_mean",
      "temporal_median",
      "mean_gamma_025",
      "median_gamma_025",
      "mean_clahe",
      "median_clahe",
      "mean_highpass",
      "luminance_temporal_std"
    ],
    "operations": {
      "gamma": "Per-channel gamma 0.25 on 8-bit composite.",
      "clahe": "CLAHE on CIELAB L channel, clip limit 2.0, 16x16 tile grid.",
      "highpass": "Absolute grayscale residual after Gaussian blur sigma 3, normalized for display.",
      "temporal_std": "Per-pixel grayscale standard deviation across 1-second samples, normalized for display."
    }
  },
  "temporal_metrics": {
    "median_frame_gray_mae_from_temporal_mean": 0.13654176311728394,
    "p95_frame_gray_mae_from_temporal_mean": 0.1404471450617284,
    "median_pixel_luminance_std": 0.0,
    "p95_pixel_luminance_std": 0.576852560043335
  },
  "automatic_qr_checks": {
    "temporal_mean": {
      "decoded_text": "",
      "detected_geometry": false,
      "unique_corner_count": 0,
      "quadrilateral_area_px2": 0.0,
      "usable_four_corner_geometry": false,
      "corners": []
    },
    "temporal_median": {
      "decoded_text": "",
      "detected_geometry": false,
      "unique_corner_count": 0,
      "quadrilateral_area_px2": 0.0,
      "usable_four_corner_geometry": false,
      "corners": []
    },
    "mean_gamma_025": {
      "decoded_text": "",
      "detected_geometry": false,
      "unique_corner_count": 0,
      "quadrilateral_area_px2": 0.0,
      "usable_four_corner_geometry": false,
      "corners": []
    },
    "median_gamma_025": {
      "decoded_text": "",
      "detected_geometry": true,
      "unique_corner_count": 3,
      "quadrilateral_area_px2": 0.0,
      "usable_four_corner_geometry": false,
      "corners": [
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        ],
        [
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        [
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        [
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      ]
    },
    "mean_clahe": {
      "decoded_text": "",
      "detected_geometry": false,
      "unique_corner_count": 0,
      "quadrilateral_area_px2": 0.0,
      "usable_four_corner_geometry": false,
      "corners": []
    },
    "median_clahe": {
      "decoded_text": "",
      "detected_geometry": false,
      "unique_corner_count": 0,
      "quadrilateral_area_px2": 0.0,
      "usable_four_corner_geometry": false,
      "corners": []
    },
    "mean_highpass": {
      "decoded_text": "",
      "detected_geometry": false,
      "unique_corner_count": 0,
      "quadrilateral_area_px2": 0.0,
      "usable_four_corner_geometry": false,
      "corners": []
    },
    "luminance_temporal_std": {
      "decoded_text": "",
      "detected_geometry": false,
      "unique_corner_count": 0,
      "quadrilateral_area_px2": 0.0,
      "usable_four_corner_geometry": false,
      "corners": []
    }
  },
  "limits": [
    "The source is the preserved lossy YouTube transcode, not a recovered original upload.",
    "Temporal stacking can improve a fixed low-contrast overlay but cannot validate arbitrary LSB, cryptographic, or time-varying encodings.",
    "No decoded text or usable four-corner QR geometry is a narrow automated observation, not proof that the composites contain no possible human-readable clue."
  ],
  "conclusion": "The predeclared temporal mean, median, gamma, local-contrast, high-pass, and variance derivatives produce no decoded text or usable four-corner QR geometry. One gamma variant causes a degenerate detector response with fewer than four unique corners; it is recorded as a false-positive geometry, not a QR result. The derivatives are published for inspection, but do not recover an address, command, or next-message target from the preserved transcode."
}