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# sourceVideoAverageFrameDuration

A time value that describes the average frame duration of the video data.

```
var sourceVideoAverageFrameDuration: CMTime { get set }
```

## Discussion

Setting this property enables the output settings assistant to generate more complete video settings. After setting a value, requery the [`videoSettings`](/documentation/AVFoundation/AVOutputSettingsAssistant/videoSettings) property to get the latest values.

The default value is `1/30`, which means the output settings assistant assumes that your source video has a frame rate of 30fps.

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