---
title: passDescriptions
framework: avfoundation
role: symbol
role_heading: Instance Property
path: avfoundation/avassetwriterinput/multipasscontroller/passdescriptions
---

# passDescriptions

An async sequence of pass descriptions to iterate over if multi-pass is supported. This property is nil when multi-pass is not supported.

## Declaration

```swift
var passDescriptions: (some AsyncSequence<AVAssetWriterInputPassDescription, Never>)? { get }
```