> For the complete documentation index, see [llms.txt](https://doc.ozforensics.com/oz-knowledge/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://doc.ozforensics.com/oz-knowledge/guides/developer-guide/api/oz-api/basic-scenarios/liveness/best-shot.md).

# Best Shot

The "Best shot" algorithm is intended to choose the most high-quality and well-tuned frame with a face from a video record. This algorithm works as a part of the [liveness](/oz-knowledge/guides/developer-guide/api/oz-api/basic-scenarios/liveness.md) analysis, so here, we describe only the best shot part. Starting with API v6.0.1, the best shot is extracted and returned in the API response by default unless disabled for a specific purpose.

{% hint style="info" %}
Please note: historically, some instances are configured to allow Best Shot only for certain gestures.
{% endhint %}

### Processing steps

1\. Initiate the analysis similar to [Liveness](/oz-knowledge/guides/developer-guide/api/oz-api/basic-scenarios/liveness.md#processing-steps), but make sure that `extract_best_shot` is set to `true` as shown below, or this line is omitted (for API 6.0.1 and newer): 

{% code title="request body" %}

```javascript
{
  "analyses": [{
    "type": "quality",
    "source_media": ["1111aaaa-11aa-11aa-11aa-111111aaaaaa"], // // optional; omit to include all media from the folder
    "params" : {
      "extract_best_shot": true // the mandatory part for the best shot analysis
    }
  }]
}
```

{% endcode %}

If you want to use a webhook for response, add it to the payload at this step, as described [here](/oz-knowledge/guides/developer-guide/api/oz-api/use-cases/using-a-webhook-to-get-results.md).

2\. Check and interpret results in the same way as for the pure [Liveness](/oz-knowledge/guides/developer-guide/api/oz-api/basic-scenarios/liveness.md#processing-steps) analysis.

3\. The URL to the best shot is located in the `analyses.results_media -> output_images -> original_url` response under `analyses.results_media -> output_images -> original_name = "ResultImage.jpg"`.


---

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