---
title: "init(mediaType:segmentConfigurations:assemblyTrackID:)"
framework: avfoundation
role: symbol
role_heading: Initializer
path: "avfoundation/avassettrackplan/init(mediatype:segmentconfigurations:assemblytrackid:)"
---

# init(mediaType:segmentConfigurations:assemblyTrackID:)

## Declaration

```swift
init(mediaType: AVMediaType, segmentConfigurations: [AVPlannedSegmentConfiguration], assemblyTrackID trackID: CMPersistentTrackID)
```

## Parameters

- `mediaType`: Media type of the track
- `segmentConfigurations`: Segment configurations of the track
- `trackID`: The trackID that identifies this track in the assemblyComposition the planner passes to the completion handler of the incremental writing session.

## Discussion

Discussion Returns an instance of AVAssetTrackPlan This initializer throws NSInvalidArgumentException if trackID is kCMPersistentTrackID_Invalid.