{
  "format_start": "0.000000",
  "stream_starts": [
    {
      "index": 0,
      "codec_type": "video",
      "time_base": "1/1000",
      "start_time": "0.000000"
    },
    {
      "index": 1,
      "codec_type": "audio",
      "time_base": "1/1000",
      "start_time": "0.400000"
    }
  ],
  "first_packets": [
    {
      "codec_type": "video",
      "stream_index": 0,
      "pts": 0,
      "pts_time": "0.000000",
      "dts": 0,
      "dts_time": "0.000000",
      "duration": 100,
      "duration_time": "0.100000",
      "size": "2161",
      "pos": "757",
      "flags": "K__"
    },
    {
      "codec_type": "audio",
      "stream_index": 1,
      "pts": 400,
      "pts_time": "0.400000",
      "dts": 400,
      "dts_time": "0.400000",
      "duration": 23,
      "duration_time": "0.023000",
      "size": "2048",
      "pos": "11333",
      "flags": "K__"
    }
  ],
  "relative_start_seconds": "2/5",
  "decode": {
    "file": "offset.mkv",
    "exit_code": 0,
    "stderr": ""
  }
}