---
title: preferredVolume
framework: avfoundation
role: symbol
role_heading: Instance Property
path: avfoundation/avassetwriterinput/preferredvolume
---

# preferredVolume

The volume to prefer for playback of the output’s audio data.

## Declaration

```swift
var preferredVolume: Float { get set }
```

## Discussion

Discussion The default value for audio data is 1.0, which indicates typical playback level. Set the value for this property in the range of 0.0 to 1.0. For nonaudio media, the default value is 0.0. You can’t set this value after writing starts.

## See Also

### Configuring presentation

- [naturalSize](avfoundation/avassetwriterinput/naturalsize.md)
- [transform](avfoundation/avassetwriterinput/transform.md)
- [mediaTimeScale](avfoundation/avassetwriterinput/mediatimescale.md)
- [marksOutputTrackAsEnabled](avfoundation/avassetwriterinput/marksoutputtrackasenabled.md)