{
  "requested_second": 121,
  "exact_baseline_frame": {
    "id": "f3630",
    "source_frame_index": 3630,
    "timestamp_seconds": 121.0,
    "source_pts_seconds": 121.0,
    "timestamp": "121.000000",
    "reasons": [
      "baseline_1fps",
      "motion_dense",
      "scene_context"
    ],
    "image": "https://ai-video-relay-check-20261027.pages.dev/frames/frame-00003630.webp",
    "width": 405,
    "height": 720,
    "selection_reasons": [
      "baseline_1fps_or_last"
    ],
    "source_width": 720,
    "source_height": 1280,
    "image_url": "https://ai-video-relay-check-20261027.pages.dev/frames/frame-00003630.webp"
  },
  "nearby_frames": [
    {
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      "source_frame_index": 3622,
      "timestamp_seconds": 120.73333333333333,
      "source_pts_seconds": 120.73333333333333,
      "timestamp": "120.733333",
      "reasons": [
        "motion_dense"
      ],
      "image": "https://ai-video-relay-check-20261027.pages.dev/frames/frame-00003622.webp",
      "width": 405,
      "height": 720,
      "selection_reasons": [
        "local_motion_4fps"
      ],
      "source_width": 720,
      "source_height": 1280,
      "image_url": "https://ai-video-relay-check-20261027.pages.dev/frames/frame-00003622.webp"
    },
    {
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      "source_frame_index": 3629,
      "timestamp_seconds": 120.96666666666667,
      "source_pts_seconds": 120.96666666666667,
      "timestamp": "120.966667",
      "reasons": [
        "scene_context"
      ],
      "image": "https://ai-video-relay-check-20261027.pages.dev/frames/frame-00003629.webp",
      "width": 405,
      "height": 720,
      "selection_reasons": [
        "local_motion_4fps"
      ],
      "source_width": 720,
      "source_height": 1280,
      "image_url": "https://ai-video-relay-check-20261027.pages.dev/frames/frame-00003629.webp"
    },
    {
      "id": "f3630",
      "source_frame_index": 3630,
      "timestamp_seconds": 121.0,
      "source_pts_seconds": 121.0,
      "timestamp": "121.000000",
      "reasons": [
        "baseline_1fps",
        "motion_dense",
        "scene_context"
      ],
      "image": "https://ai-video-relay-check-20261027.pages.dev/frames/frame-00003630.webp",
      "width": 405,
      "height": 720,
      "selection_reasons": [
        "baseline_1fps_or_last"
      ],
      "source_width": 720,
      "source_height": 1280,
      "image_url": "https://ai-video-relay-check-20261027.pages.dev/frames/frame-00003630.webp"
    },
    {
      "id": "f3631",
      "source_frame_index": 3631,
      "timestamp_seconds": 121.03333333333333,
      "source_pts_seconds": 121.03333333333333,
      "timestamp": "121.033333",
      "reasons": [
        "scene_context"
      ],
      "image": "https://ai-video-relay-check-20261027.pages.dev/frames/frame-00003631.webp",
      "width": 405,
      "height": 720,
      "selection_reasons": [
        "interval_last"
      ],
      "source_width": 720,
      "source_height": 1280,
      "image_url": "https://ai-video-relay-check-20261027.pages.dev/frames/frame-00003631.webp"
    },
    {
      "id": "f3632",
      "source_frame_index": 3632,
      "timestamp_seconds": 121.06666666666666,
      "source_pts_seconds": 121.06666666666666,
      "timestamp": "121.066667",
      "reasons": [
        "scene_change",
        "scene_context"
      ],
      "image": "https://ai-video-relay-check-20261027.pages.dev/frames/frame-00003632.webp",
      "width": 405,
      "height": 720,
      "selection_reasons": [
        "interval_first"
      ],
      "source_width": 720,
      "source_height": 1280,
      "image_url": "https://ai-video-relay-check-20261027.pages.dev/frames/frame-00003632.webp"
    }
  ],
  "screen_observation": {
    "time": 121.0,
    "source_frame_index": 3630,
    "raw_ocr": "",
    "raw_caption": "",
    "raw_title": "",
    "screen_caption": "",
    "screen_title": "",
    "reviewed_changes": [],
    "verification": "automatic OCR; not independently verified",
    "timing": "observed frame time; onset/offset not known to subsecond precision",
    "is_confirmed_speech": false
  },
  "raw_ASR_at_estimated_time": [],
  "content_section": {
    "index": 11,
    "start": 118.3,
    "end": 121.066667,
    "title": "长发被掀起后的人物揭示",
    "visual_observation": "长发背影面向屏幕，随后头发被掀起，人物回头时露出光头。",
    "camera": "背后拍摄后出现转头与揭示动作。",
    "uncertainty": "这是与前段不同画面的剪辑，不把两段身份强行合并。",
    "provenance": "assistant visual review of source-frame sheets; not an independent human or automatic semantic-model benchmark"
  },
  "unknowns": [
    "ASR not a verified listening transcript",
    "Caption display time can differ from speech time",
    "Assistant observation must be cross-checked by actually opening image"
  ]
}