---
title: originalFormatDescription
framework: avfoundation
role: symbol
role_heading: Instance Property
path: avfoundation/avcompositiontrackformatdescriptionreplacement/originalformatdescription
---

# originalFormatDescription

The format description to replace.

## Declaration

```swift
var originalFormatDescription: CMFormatDescription { get }
```

## See Also

### Managing format descriptions

- [replacementFormatDescription](avfoundation/avcompositiontrackformatdescriptionreplacement/replacementformatdescription.md)