---
title: kVTDecompressionPropertyKey_OutputPoolRequestedMinimumBufferCount
framework: videotoolbox
role: symbol
role_heading: Global Variable
path: videotoolbox/kvtdecompressionpropertykey_outputpoolrequestedminimumbuffercount
---

# kVTDecompressionPropertyKey_OutputPoolRequestedMinimumBufferCount

The requested minimum buffer count that a decompression session should use for its output pixel buffer pool, without releasing buffers while the number in use is below this level.

## Declaration

```swift
let kVTDecompressionPropertyKey_OutputPoolRequestedMinimumBufferCount: CFString
```

## Discussion

Discussion This property effectively requests that the kCVPixelBufferPoolMinimumBufferCountKey key be used for the creation of the output CVPixelBufferPool. For general playback cases, standard CVPixelBufferPool age-out behavior is sufficient, and this property isn’t necessary.  Use this property only in unusual playback scenarios where a peak pool level is known, and the potential memory overhead is an acceptable tradeoff to avoid possible buffer reallocation. Setting this property to NULL or passing in the value 0 clears this setting and removes the minimum buffer count. Setting this property while a decompression session is in use results in the creation of a new CVPixelBufferPool. Setting this property causes new buffers to be allocated, and existing buffers to be deallocated when they are released.

## See Also

### Pixel Buffer Pools

- [kVTDecompressionPropertyKey_PixelBufferPool](videotoolbox/kvtdecompressionpropertykey_pixelbufferpool.md)
- [kVTDecompressionPropertyKey_PixelBufferPoolIsShared](videotoolbox/kvtdecompressionpropertykey_pixelbufferpoolisshared.md)