{
  "requested_second": 146,
  "exact_baseline_frame": {
    "id": "f4380",
    "source_frame_index": 4380,
    "timestamp_seconds": 146.0,
    "source_pts_seconds": 146.0,
    "timestamp": "146.000000",
    "reasons": [
      "baseline_1fps",
      "scene_context"
    ],
    "image": "https://ai-video-relay-check-20261027.pages.dev/frames/frame-00004380.webp",
    "width": 405,
    "height": 720,
    "selection_reasons": [
      "baseline_1fps_or_last",
      "interval_last"
    ],
    "source_width": 720,
    "source_height": 1280,
    "image_url": "https://ai-video-relay-check-20261027.pages.dev/frames/frame-00004380.webp"
  },
  "nearby_frames": [
    {
      "id": "f4369",
      "source_frame_index": 4369,
      "timestamp_seconds": 145.63333333333333,
      "source_pts_seconds": 145.63333333333333,
      "timestamp": "145.633333",
      "reasons": [
        "motion_dense"
      ],
      "image": "https://ai-video-relay-check-20261027.pages.dev/frames/frame-00004369.webp",
      "width": 405,
      "height": 720,
      "selection_reasons": [
        "interval_middle"
      ],
      "source_width": 720,
      "source_height": 1280,
      "image_url": "https://ai-video-relay-check-20261027.pages.dev/frames/frame-00004369.webp"
    },
    {
      "id": "f4380",
      "source_frame_index": 4380,
      "timestamp_seconds": 146.0,
      "source_pts_seconds": 146.0,
      "timestamp": "146.000000",
      "reasons": [
        "baseline_1fps",
        "scene_context"
      ],
      "image": "https://ai-video-relay-check-20261027.pages.dev/frames/frame-00004380.webp",
      "width": 405,
      "height": 720,
      "selection_reasons": [
        "baseline_1fps_or_last",
        "interval_last"
      ],
      "source_width": 720,
      "source_height": 1280,
      "image_url": "https://ai-video-relay-check-20261027.pages.dev/frames/frame-00004380.webp"
    },
    {
      "id": "f4381",
      "source_frame_index": 4381,
      "timestamp_seconds": 146.03333333333333,
      "source_pts_seconds": 146.03333333333333,
      "timestamp": "146.033333",
      "reasons": [
        "motion_dense",
        "scene_change",
        "scene_context"
      ],
      "image": "https://ai-video-relay-check-20261027.pages.dev/frames/frame-00004381.webp",
      "width": 405,
      "height": 720,
      "selection_reasons": [
        "interval_first",
        "local_motion_4fps"
      ],
      "source_width": 720,
      "source_height": 1280,
      "image_url": "https://ai-video-relay-check-20261027.pages.dev/frames/frame-00004381.webp"
    },
    {
      "id": "f4389",
      "source_frame_index": 4389,
      "timestamp_seconds": 146.3,
      "source_pts_seconds": 146.3,
      "timestamp": "146.300000",
      "reasons": [
        "motion_dense"
      ],
      "image": "https://ai-video-relay-check-20261027.pages.dev/frames/frame-00004389.webp",
      "width": 405,
      "height": 720,
      "selection_reasons": [
        "interval_middle",
        "local_motion_4fps"
      ],
      "source_width": 720,
      "source_height": 1280,
      "image_url": "https://ai-video-relay-check-20261027.pages.dev/frames/frame-00004389.webp"
    },
    {
      "id": "f4393",
      "source_frame_index": 4393,
      "timestamp_seconds": 146.43333333333334,
      "source_pts_seconds": 146.43333333333334,
      "timestamp": "146.433333",
      "reasons": [
        "motion_dense"
      ],
      "image": "https://ai-video-relay-check-20261027.pages.dev/frames/frame-00004393.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-00004393.webp"
    }
  ],
  "screen_observation": {
    "time": 146.0,
    "source_frame_index": 4380,
    "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": 18,
    "start": 145.3,
    "end": 146.033333,
    "title": "彩条过渡",
    "visual_observation": "多色测试条。",
    "camera": "剪辑过渡。",
    "uncertainty": "",
    "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"
  ]
}