---
title: containsAlphaChannel
framework: avfoundation
role: symbol
role_heading: Type Property
path: avfoundation/avmediacharacteristic/containsalphachannel
---

# containsAlphaChannel

A media characteristic that indicates that a track contains an alpha channel.

## Declaration

```swift
static let containsAlphaChannel: AVMediaCharacteristic
```

## Discussion

Discussion To determine whether the alpha is straight or pre-multiplied, look for a format description extension with key kCMFormatDescriptionExtension_AlphaChannelMode.

## See Also

### Visual

- [visual](avfoundation/avmediacharacteristic/visual.md)
- [containsHDRVideo](avfoundation/avmediacharacteristic/containshdrvideo.md)
- [frameBased](avfoundation/avmediacharacteristic/framebased.md)
- [usesWideGamutColorSpace](avfoundation/avmediacharacteristic/useswidegamutcolorspace.md)
- [containsStereoMultiviewVideo](avfoundation/avmediacharacteristic/containsstereomultiviewvideo.md)
- [carriesVideoStereoMetadata](avfoundation/avmediacharacteristic/carriesvideostereometadata.md)
- [indicatesHorizontalFieldOfView](avfoundation/avmediacharacteristic/indicateshorizontalfieldofview.md)
- [indicatesNonRectilinearProjection](avfoundation/avmediacharacteristic/indicatesnonrectilinearprojection.md)