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# outputDuration

The output duration of the sample buffer.

```
var outputDuration: CMTime { get }
```

## Discussion

This is the duration of decoded, trimmed and stretched samples. It is calculated as:
`(Duration - TrimDurationAtStart - TrimDurationAtEnd) / SpeedMultiplier`.

- Duration is `duration` property of this sample buffer.
- TrimDurationAtStart is the value of [`trimDurationAtStart`](/documentation/CoreMedia/CMSampleBuffer/AttachmentKey/trimDurationAtStart) attachment (default 0).
- TrimDurationAtEnd is the value of [`trimDurationAtEnd`](/documentation/CoreMedia/CMSampleBuffer/AttachmentKey/trimDurationAtEnd) attachment (default 0).
- SpeedMultiplier is the value of [`speedMultiplier`](/documentation/CoreMedia/CMSampleBuffer/AttachmentKey/speedMultiplier) attachment (default 1).

---

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