<!--
{
  "availability" : [
    "iOS: 17.0.0 -",
    "iPadOS: 17.0.0 -",
    "macCatalyst: 17.0.0 -",
    "macOS: 14.0.0 -",
    "visionOS: 1.0.0 -"
  ],
  "documentType" : "symbol",
  "framework" : "VideoToolbox",
  "identifier" : "/documentation/VideoToolbox/kVTCompressionPropertyKey_MVHEVCVideoLayerIDs",
  "metadataVersion" : "0.1.0",
  "role" : "Global Variable",
  "symbol" : {
    "kind" : "Global Variable",
    "modules" : [
      "Video Toolbox"
    ],
    "preciseIdentifier" : "c:@kVTCompressionPropertyKey_MVHEVCVideoLayerIDs"
  },
  "title" : "kVTCompressionPropertyKey_MVHEVCVideoLayerIDs"
}
-->

# kVTCompressionPropertyKey_MVHEVCVideoLayerIDs

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

```
let kVTCompressionPropertyKey_MVHEVCVideoLayerIDs: CFString
```

## Discussion

This property is specific to MV-HEVC.

Specifying layer ID values advises the encoder to expect <doc://com.apple.documentation/documentation/CoreMedia/CMTaggedBufferGroupRef> objects with specific <doc://com.apple.documentation/documentation/CoreMedia/CMTag-swift.class> values that reference them.

The default value is `NULL`.

---

Copyright &copy; 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)