<!--
{
  "availability" : [
    "iOS: 15.0.0 -",
    "iPadOS: 15.0.0 -",
    "macCatalyst: -",
    "macOS: 12.0.0 -",
    "tvOS: 15.0.0 -",
    "visionOS: 1.0.0 -",
    "watchOS: 8.0.0 -"
  ],
  "documentType" : "symbol",
  "framework" : "AVFoundation",
  "identifier" : "/documentation/AVFoundation/AVPartialAsyncProperty/nominalFrameRate",
  "metadataVersion" : "0.1.0",
  "role" : "Type Property",
  "symbol" : {
    "kind" : "Type Property",
    "modules" : [
      "AVFoundation"
    ],
    "preciseIdentifier" : "s:12AVFoundation22AVPartialAsyncPropertyCAASo12AVAssetTrackCRbzlE16nominalFrameRateAA07AVAsyncD0CyxSfGvpZ"
  },
  "title" : "nominalFrameRate"
}
-->

# nominalFrameRate

The frame rate of the track, in frames per second.

```
static var nominalFrameRate: AVAsyncProperty<Root, Float> { get }
```

## Discussion

Use the [`load(_:isolation:)`](/documentation/AVFoundation/AVAsynchronousKeyValueLoading/load(_:isolation:)) method to retrieve the property value.

The nominal frame rate indicates the number of frames per second for tracks that contain a full frame per media sample. For field-based (interlaced) video tracks, the value of this property indicates the field rate, not the frame rate.

---

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)