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# sampleTimingInfo(at:)

Returns sample timing information for a sample at the specified index.

```
func sampleTimingInfo(at sampleIndex: CMItemIndex) throws -> CMSampleTimingInfo
```

## Parameters

`sampleIndex`

The index of the sample to query for sample timing. The system raises an error if the sample index is out of range.

## Return Value

A structure that contains the decode and presentation timestamps of a sample.

## Discussion

The system throws a [`bufferHasNoSampleTimingInfo`](/documentation/CoreMedia/CMSampleBuffer/Error/bufferHasNoSampleTimingInfo) error if the buffer doesn’t contain sample timing.

---

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