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# VTCompressionSessionInvalidate(_:)

Tears down a compression session.

```
func VTCompressionSessionInvalidate(_ session: VTCompressionSession)
```

## Parameters

`session`

The compression session to invalidate.

## Discussion

When you finish using a compression session you created, call `VTCompressionSessionInvalidate` to tear it down, and then call <doc://com.apple.documentation/documentation/CoreFoundation/CFRelease> to release its memory.

> Note:
> A compression session is automatically invalidated when its retain count reaches zero, but because sessions may be retained by multiple parties, it’s hard to predict when this will happen.  Calling `VTCompressionSessionInvalidate` ensures a deterministic, orderly teardown.

---

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