---
title: requiredFormatDescription
framework: Immersive Media Support
role: symbol
role_heading: Instance Property
platforms: [iOS 26.4+, iPadOS 26.4+, Mac Catalyst 26.4+, macOS 26.0+, visionOS 26.0+]
path: immersivemediasupport/parametricimmersiveassetinfo/requiredformatdescription
---

# requiredFormatDescription

A result format descriptor for overriding a mutable video track that’s used to convert the asset to parametric immersive asset. Use replaceFormatDescription to replace the format description on the AVMutableMovieTrack.

## Declaration

```swift
var requiredFormatDescription: CMFormatDescription? { get }
```