---
title: AVCompositionTrackFormatDescriptionReplacement
framework: avfoundation
role: symbol
role_heading: Class
path: avfoundation/avcompositiontrackformatdescriptionreplacement
---

# AVCompositionTrackFormatDescriptionReplacement

An object that represents a format description and its replacement.

## Declaration

```swift
class AVCompositionTrackFormatDescriptionReplacement
```

## Topics

### Managing format descriptions

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

### Initializers

- [init(coder:)](avfoundation/avcompositiontrackformatdescriptionreplacement/init(coder:).md)

## Relationships

### Inherits From

- [NSObject](objectivec/nsobject-swift.class.md)

### Conforms To

- [CVarArg](swift/cvararg.md)
- [CustomDebugStringConvertible](swift/customdebugstringconvertible.md)
- [CustomStringConvertible](swift/customstringconvertible.md)
- [Equatable](swift/equatable.md)
- [Hashable](swift/hashable.md)
- [NSCoding](foundation/nscoding.md)
- [NSObjectProtocol](objectivec/nsobjectprotocol.md)
- [NSSecureCoding](foundation/nssecurecoding.md)
- [Sendable](swift/sendable.md)
- [SendableMetatype](swift/sendablemetatype.md)

## See Also

### Managing format descriptions

- [formatDescriptions](avfoundation/avcompositiontrack/formatdescriptions.md)
- [formatDescriptionReplacements](avfoundation/avcompositiontrack/formatdescriptionreplacements.md)