---
title: kVTCompressionPropertyKey_MVHEVCVideoLayerIDs
framework: videotoolbox
role: symbol
role_heading: Global Variable
path: videotoolbox/kvtcompressionpropertykey_mvhevcvideolayerids
---

# kVTCompressionPropertyKey_MVHEVCVideoLayerIDs

The identifiers of the video layers to encode in a multiview encoding operation.

## Declaration

```swift
let kVTCompressionPropertyKey_MVHEVCVideoLayerIDs: CFString
```

## Discussion

Discussion This property is specific to MV-HEVC. Specifying layer ID values advises the encoder to expect CMTaggedBufferGroupRef objects with specific CMTag values that reference them. The default value is NULL.

## See Also

### Multiview Compression

- [kVTCompressionPropertyKey_MVHEVCLeftAndRightViewIDs](videotoolbox/kvtcompressionpropertykey_mvhevcleftandrightviewids.md)
- [kVTCompressionPropertyKey_MVHEVCViewIDs](videotoolbox/kvtcompressionpropertykey_mvhevcviewids.md)