{
  "requested_second": 70,
  "exact_baseline_frame": {
    "id": "f2100",
    "source_frame_index": 2100,
    "timestamp_seconds": 70.0,
    "source_pts_seconds": 70.0,
    "timestamp": "70.000000",
    "reasons": [
      "baseline_1fps",
      "motion_dense"
    ],
    "image": "https://ai-video-relay-check-20261027.pages.dev/frames/frame-00002100.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-00002100.webp"
  },
  "nearby_frames": [
    {
      "id": "f2070",
      "source_frame_index": 2070,
      "timestamp_seconds": 69.0,
      "source_pts_seconds": 69.0,
      "timestamp": "69.000000",
      "reasons": [
        "baseline_1fps"
      ],
      "image": "https://ai-video-relay-check-20261027.pages.dev/frames/frame-00002070.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-00002070.webp"
    },
    {
      "id": "f2100",
      "source_frame_index": 2100,
      "timestamp_seconds": 70.0,
      "source_pts_seconds": 70.0,
      "timestamp": "70.000000",
      "reasons": [
        "baseline_1fps",
        "motion_dense"
      ],
      "image": "https://ai-video-relay-check-20261027.pages.dev/frames/frame-00002100.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-00002100.webp"
    },
    {
      "id": "f2130",
      "source_frame_index": 2130,
      "timestamp_seconds": 71.0,
      "source_pts_seconds": 71.0,
      "timestamp": "71.000000",
      "reasons": [
        "baseline_1fps"
      ],
      "image": "https://ai-video-relay-check-20261027.pages.dev/frames/frame-00002130.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-00002130.webp"
    }
  ],
  "screen_observation": {
    "time": 70.0,
    "source_frame_index": 2100,
    "raw_ocr": "很多人认为忍者是文艺作品里虚构的东西",
    "raw_caption": "很多人认为忍者是文艺作品里虚构的东西",
    "raw_title": "",
    "screen_caption": "很多人认为忍者是文艺作品里虚构的东西",
    "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": [
    {
      "start": 69.38,
      "end": 72.08,
      "text": "忍者是文艺作品里虚构的东西",
      "confidence": {
        "no_speech_prob": 1.6627362681154167e-11,
        "avg_logprob": -0.12073457847207279
      }
    }
  ],
  "content_section": {
    "index": 3,
    "start": 68.433333,
    "end": 81.433333,
    "title": "白色背心人物讲解忍者",
    "visual_observation": "白色背心人物在镜头前摆手、指向自己，字幕依次谈到忍者、文艺作品、中国及十秒证明。",
    "camera": "中间为人物视频，上下黑边；机位较稳定。",
    "uncertainty": "字幕与声音应分列，不把衣物或背景字当对白。",
    "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"
  ]
}