---
title: hevcTemporalInfo
framework: coremedia
role: symbol
role_heading: Instance Property
path: coremedia/cmsamplebuffer/sampleattachments-swift.struct/hevctemporalinfo
---

# hevcTemporalInfo

Indicates a video frame’s level within a hierarchical frame dependency structure.

## Declaration

```swift
var hevcTemporalInfo: CMSampleBuffer.HEVCTemporalInfo? { get set }
```

## Discussion

Discussion When present, the temporal level attachments among a group of video frames provide information about where inter-frame dependencies may and may not exist. This attachment is read from and written to media files.