<!--
{
  "availability" : [
    "iOS: 27.0.0 -",
    "iPadOS: 27.0.0 -",
    "macCatalyst: 27.0.0 -",
    "macOS: 27.0.0 -",
    "tvOS: 27.0.0 -"
  ],
  "documentType" : "symbol",
  "framework" : "AVFoundation",
  "identifier" : "/documentation/AVFoundation/AVAssetWriter/usesProVideoStorage",
  "metadataVersion" : "0.1.0",
  "role" : "Instance Property",
  "symbol" : {
    "kind" : "Instance Property",
    "modules" : [
      "AVFoundation"
    ],
    "preciseIdentifier" : "c:objc(cs)AVAssetWriter(py)usesProVideoStorage"
  },
  "title" : "usesProVideoStorage"
}
-->

# usesProVideoStorage

Indicates whether to use pre-allocated storage.

```
var usesProVideoStorage: Bool { get set }
```

## Discussion

The default value is `NO`. See more detailed description of ProVideoStorage in `AVProVideoStorage.h`.

An exception will be thrown if clients try to set `YES` if the value of the `proVideoStorageSupported` property is `NO`.

An exception will be thrown if clients try to set this property after `-startWriting` has been called on the receiver.

---

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)