---
title: sourceTrackIDForFrameTiming
framework: avfoundation
role: symbol
role_heading: Instance Property
path: avfoundation/avvideocomposition/configuration/sourcetrackidforframetiming
---

# sourceTrackIDForFrameTiming

An identifier of the source track from which the video composition derives frame timing.

## Declaration

```swift
var sourceTrackIDForFrameTiming: CMPersistentTrackID { get set }
```

## See Also

### Inspecting the configuration

- [renderSize](avfoundation/avvideocomposition/configuration/rendersize.md)
- [renderScale](avfoundation/avvideocomposition/configuration/renderscale.md)
- [frameDuration](avfoundation/avvideocomposition/configuration/frameduration.md)
- [animationTool](avfoundation/avvideocomposition/configuration/animationtool.md)
- [colorPrimaries](avfoundation/avvideocomposition/configuration/colorprimaries.md)
- [colorTransferFunction](avfoundation/avvideocomposition/configuration/colortransferfunction.md)
- [colorYCbCrMatrix](avfoundation/avvideocomposition/configuration/colorycbcrmatrix.md)
- [customVideoCompositorClass](avfoundation/avvideocomposition/configuration/customvideocompositorclass.md)
- [outputBufferDescription](avfoundation/avvideocomposition/configuration/outputbufferdescription.md)
- [instructions](avfoundation/avvideocomposition/configuration/instructions.md)
- [spatialVideoConfigurations](avfoundation/avvideocomposition/configuration/spatialvideoconfigurations.md)
- [perFrameHDRDisplayMetadataPolicy](avfoundation/avvideocomposition/configuration/perframehdrdisplaymetadatapolicy.md)
- [sourceSampleDataTrackIDs](avfoundation/avvideocomposition/configuration/sourcesampledatatrackids.md)