---
title: endsPreviousSampleDuration
framework: coremedia
role: symbol
role_heading: Type Property
path: coremedia/cmsamplebufferattachmentkeydefinitions/endsprevioussampleduration
---

# endsPreviousSampleDuration

Indicates that sample buffer’s decode timestamp may be used to define the previous sample buffer’s duration.

## Declaration

```swift
static let endsPreviousSampleDuration: CVAttachmentKeyDefinitionWithDefault<CMSampleBufferAttachmentKeyDefinitions.ShouldPropagate, Bool>
```

## Discussion

Discussion Marker sample buffers with this attachment may be used in situations where sample buffers are transmitted before their duration is known. In such situations, normally the recipient may use each sample buffer’s timestamp to calculate the duration of the previous sample buffer. The marker sample buffer with this attachment is sent to provide the timestamp for calculating the final sample buffer’s duration. The getter returns the default value of false if this attachment is not present.