{
  "sourceUrl": "https://www.youtube.com/watch?v=XDYilxy1dn8",
  "publicationDate": "2025-07-29",
  "sourceFrames": [
    150,
    156
  ],
  "nominalFps": 30,
  "observedCutAtSourceFrame": 153,
  "nominalCutSeconds": 5.1,
  "frames": [
    {
      "sourceFrame": 150,
      "localFrame": 35,
      "existingStudy": "study-outline-page-turn",
      "nativePng": {
        "path": "book-underline-boundary/source-000150.png",
        "sha256": "07c5cfe5c12eb7064061957874c3f7c7b8e9dbfee76591ba0c70a14f7a88d215",
        "bytes": 22150
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      "indexSha256": "1b1ec9290a9b95ce96b28569405bf2d143c52d1b81400229008b0f178a90a8d3",
      "darkInkBoundsXYXYAtLumaBelow64": [
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      ]
    },
    {
      "sourceFrame": 151,
      "localFrame": 36,
      "existingStudy": "study-outline-page-turn",
      "nativePng": {
        "path": "book-underline-boundary/source-000151.png",
        "sha256": "6c79b013dd5b7f717cb6bbfc5d3f78a2ffb5898530c85200f2fc7d2b583236fc",
        "bytes": 21789
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      "indexSha256": "1b1ec9290a9b95ce96b28569405bf2d143c52d1b81400229008b0f178a90a8d3",
      "darkInkBoundsXYXYAtLumaBelow64": [
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        641
      ]
    },
    {
      "sourceFrame": 152,
      "localFrame": 37,
      "existingStudy": "study-outline-page-turn",
      "nativePng": {
        "path": "book-underline-boundary/source-000152.png",
        "sha256": "856a86a74d0683735c2dd3a04a2115d94dd1f7dfb51914b0305bb90b9fd9f379",
        "bytes": 21518
      },
      "indexSha256": "1b1ec9290a9b95ce96b28569405bf2d143c52d1b81400229008b0f178a90a8d3",
      "darkInkBoundsXYXYAtLumaBelow64": [
        902,
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        641
      ]
    },
    {
      "sourceFrame": 153,
      "localFrame": 0,
      "existingStudy": "study-keyword-double-underline",
      "nativePng": {
        "path": "book-underline-boundary/source-000153.png",
        "sha256": "ec0154cd498e74a7f39aa4c8938f88fd550ecdc76f4039173246346081cbbd2d",
        "bytes": 297646
      },
      "indexSha256": "2abe0bfde3d1c5210760976e9b80eead9850de3133b230c4ab1dd4d19605a2b4",
      "darkInkBoundsXYXYAtLumaBelow64": null
    },
    {
      "sourceFrame": 154,
      "localFrame": 1,
      "existingStudy": "study-keyword-double-underline",
      "nativePng": {
        "path": "book-underline-boundary/source-000154.png",
        "sha256": "e1e82c3d758e04d4fff636bcaf084fa93e9cbec8cf005ecc6e8b9cf86613152d",
        "bytes": 299157
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      "indexSha256": "2abe0bfde3d1c5210760976e9b80eead9850de3133b230c4ab1dd4d19605a2b4",
      "darkInkBoundsXYXYAtLumaBelow64": null
    },
    {
      "sourceFrame": 155,
      "localFrame": 2,
      "existingStudy": "study-keyword-double-underline",
      "nativePng": {
        "path": "book-underline-boundary/source-000155.png",
        "sha256": "941c3fb57501633c8cd1cfa2622fe223dc199e35e326d8f0333959ba84854fd8",
        "bytes": 317406
      },
      "indexSha256": "2abe0bfde3d1c5210760976e9b80eead9850de3133b230c4ab1dd4d19605a2b4",
      "darkInkBoundsXYXYAtLumaBelow64": null
    }
  ],
  "observation": "The black book remains on white and moves right through source150\u2013152. At153 the full image changes to the colored handwritten-science background without a visible mixed intermediate frame. Source154 retains that background; the word Helps is visible at155.",
  "measurement": "Dark-ink bounds use grayscale<64 on the three full1920\u00d71080 book PNGs; this is an explicit pixel threshold, not an estimated object transform or perceived speed.",
  "classification": "A sampled hard cut at152\u2192153, following ongoing rightward book displacement. The isolated book window does not show a stationary ending settle.",
  "adaptationGuidance": "Do not append an invented rest to match the source ending. The next source treatment starts with two background-only frames before the first word. An added rest is an adaptation choice, not a measured source hold.",
  "limits": [
    "Coordinator static inspection of six existing native archival PNGs, not a fresh independent or temporally perceived review.",
    "No source master or audio was opened. Nominal frame/second mapping is separate from measured source PTS.",
    "Earlier anonymous candidate verdicts stay unchanged. This adds ending context, not a new example or a moving-source win."
  ]
}