---
title: mReserved1
framework: IOKit
role: symbol
role_heading: Instance Property
platforms: [Mac Catalyst 18.4+, macOS 10.7+]
path: iokit/iovideostreamdescription/1503957-mreserved1
---

# mReserved1

## Declaration

```occ
UInt32 mReserved1;
```