# CMVideoFormatDescriptionGetHEVCParameterSetAtIndex(_:parameterSetIndex:parameterSetPointerOut:parameterSetSizeOut:parameterSetCountOut:nalUnitHeaderLengthOut:) Returns a parameter set contained in an HEVC (H.265) format description. ``` func CMVideoFormatDescriptionGetHEVCParameterSetAtIndex(_ videoDesc: CMFormatDescription, parameterSetIndex: Int, parameterSetPointerOut: UnsafeMutablePointer?>?, parameterSetSizeOut: UnsafeMutablePointer?, parameterSetCountOut: UnsafeMutablePointer?, nalUnitHeaderLengthOut NALUnitHeaderLengthOut: UnsafeMutablePointer?) -> OSStatus ``` --- Copyright © 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)