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# CMSampleBufferGetDuration(_:)

Returns the total duration of a sample buffer.

```
func CMSampleBufferGetDuration(_ sbuf: CMSampleBuffer) -> CMTime
```

## Parameters

`sbuf`

The `CMSampleBuffer` being interrogated .

## Return Value

The duration of the `CMSampleBuffer` or `kCMTimeInvalid` if there is an error.

## Discussion

If the buffer contains out-of-presentation-order samples, any gaps in the presentation timeline aren’t represented in the returned duration. The returned duration is the sum of all the individual sample durations.

---

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