{
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    "prompt_tail": "Strictly diegetic in-world sound, no scored music.",
    "mp4": "/home/kai/shared/h3_bgm_test/v1_current.mp4",
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    "bgm_risk": "HIGH"
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    "label": "v3: 强力否定",
    "prompt_tail": "Absolutely no background music, no instruments, no melody, no orchestral score, no soundtrack.",
    "mp4": "/home/kai/shared/h3_bgm_test/v3_explicit.mp4",
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    "bgm_risk": "HIGH"
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    "label": "v5: 简短否定",
    "prompt_tail": "No BGM, no background music, no score.",
    "mp4": "/home/kai/shared/h3_bgm_test/v5_short.mp4",
    "duration": 5.175,
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    "bgm_suspect_segs": 2,
    "bgm_risk": "MEDIUM"
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}