本文為英文版的機器翻譯版本，如內容有任何歧義或不一致之處，概以英文版為準。

# 用戶端信標
<a name="ad-reporting-client-side-beaconing"></a>

透過用戶端追蹤`startTimeInSeconds`元素，您可以使用 MediaTailor 來支援信標計時。

下列 JSON 回應顯示主要信標類型：印模、開始、四分位數和完成。

**注意**  
互動式廣告局 (IAB) Video Impression Measurement Guidelines 指出，廣告曝光需要廣告內容載入用戶端，並且至少開始向玩家轉譯的時間。如需詳細資訊，請參閱 IAB [網站上的數位影片廣告服務範本 (VAST)](https://www.iab.com/guidelines/vast/)。

```
{
  "avails": [
    {
      "ads": [
        {
          "adId": "8104385",
          "duration": "PT15.100000078S",
          "durationInSeconds": 15.1,
          "startTime": "PT17.817798612S",
          "startTimeInSeconds": 17.817,
          "trackingEvents": [
          {
              "beaconUrls": [
                "http://exampleadserver.com/tracking?event=impression"
              ],
              "duration": "PT15.100000078S",
              "durationInSeconds": 15.1,
              "eventId": "8104385",
              "eventType": "impression",
              "startTime": "PT17.817798612S",
              "startTimeInSeconds": 17.817
            },
            {
              "beaconUrls": [
                "http://exampleadserver.com/tracking?event=start"
              ],
              "duration": "PT0S",
              "durationInSeconds": 0.0,
              "eventId": "8104385",
              "eventType": "start",
              "startTime": "PT17.817798612S",
              "startTimeInSeconds": 17.817
            },
            {
              "beaconUrls": [
                "http://exampleadserver.com/tracking?event=firstQuartile"
              ],
              "duration": "PT0S",
              "durationInSeconds": 0.0,
              "eventId": "8104386",
              "eventType": "firstQuartile",
              "startTime": "PT21.592798631S",
              "startTimeInSeconds": 21.592
            },
             {
              "beaconUrls": [
                "http://exampleadserver.com/tracking?event=midpoint"
              ],
              "duration": "PT0S",
              "durationInSeconds": 0.0,
              "eventId": "8104387",
              "eventType": "midpoint",
              "startTime": "PT25.367798651S",
              "startTimeInSeconds": 25.367
            },
            {
              "beaconUrls": [
                "http://exampleadserver.com/tracking?event=thirdQuartile"
              ],
              "duration": "PT0S",
              "durationInSeconds": 0.0,
              "eventId": "8104388",
              "eventType": "thirdQuartile",
              "startTime": "PT29.14279867S",
              "startTimeInSeconds": 29.142
            },
            {
              "beaconUrls": [
                "http://exampleadserver.com/tracking?event=complete"
              ],
              "duration": "PT0S",
              "durationInSeconds": 0.0,
              "eventId": "8104390",
              "eventType": "complete",
              "startTime": "PT32.91779869S",
              "startTimeInSeconds": 32.917
            }
          ]
        }
      ],
      "availId": "8104385",
      "duration": "PT15.100000078S",
      "durationInSeconds": 15.1,
      "startTime": "PT17.817798612S",
      "startTimeInSeconds": 17.817
    }
  ]
}
```