---
title: "init(videoCodecType:encoderSpecification:mediaType:segmentConfigurations:assemblyTrackID:)"
framework: avfoundation
role: symbol
role_heading: Initializer
path: "avfoundation/avassetvideotrackplan/init(videocodectype:encoderspecification:mediatype:segmentconfigurations:assemblytrackid:)"
---

# init(videoCodecType:encoderSpecification:mediaType:segmentConfigurations:assemblyTrackID:)

Creates an instance of AVAssetVideoTrackPlan.

## Declaration

```swift
convenience init(videoCodecType: AVVideoCodecType, encoderSpecification: [String : any Sendable]? = nil, mediaType: AVMediaType, segmentConfigurations: [AVPlannedVideoSegmentConfiguration], assemblyTrackID: CMPersistentTrackID)
```

## Parameters

- `videoCodecType`: Video codec type of the track.
- `encoderSpecification`: A dictionary describing the characteristics of a video encoder to use. Pass nil to let the system choose an encoder. If the client provides a specification, it should omit the following keys: kVTCompressionPropertyKey_SourceFrameCount, kVTCompressionPropertyKey_MoreFramesBeforeStart, and kVTCompressionPropertyKey_MoreFramesAfterEnd, since such keys will be overwritten by the underlying implementation.
- `mediaType`: Media type of the track. Only AVMediaTypeVideo and AVMediaTypeAuxiliaryPicture are supported.
- `segmentConfigurations`: Segment configurations of the track.
- `assemblyTrackID`: The trackID that identifies this track in the assemblyComposition the planner passes to the completion handler of the incremental writing session.

## Discussion

Discussion This initializer throws NSInvalidArgumentException in the following cases: mediaType is not supported. Supported media types are AVMediaTypeVideo and AVMediaTypeAuxiliaryPicture The encoder specified by videoCodecType and encoderSpecification does not support video encoding in segments