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# CMBufferQueueGetMinPresentationTimeStamp(_:)

Gets the earliest presentation timestamp of a buffer queue.

```
func CMBufferQueueGetMinPresentationTimeStamp(_ queue: CMBufferQueue) -> CMTime
```

## Parameters

`queue`

`CMBufferQueue` being interrogated.

## Return Value

The earliest presentation timestamp of the interrogated `CMBufferQueue`.

## Discussion

The search for earliest presentation timstamp is performed in                this API. If you know your queue is sorted by presentation time,                [`CMBufferQueueGetBufferCount(_:)`](/documentation/CoreMedia/CMBufferQueueGetBufferCount(_:)) is a faster alternative. If the                `getPresentationTimeStamp` callback is `NULL`, kCMTimeInvalid will                be returned.

---

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