---
title: kVTDecompressionPropertyKey_RealTime
framework: videotoolbox
role: symbol
role_heading: Global Variable
path: videotoolbox/kvtdecompressionpropertykey_realtime
---

# kVTDecompressionPropertyKey_RealTime

A Boolean value indicating whether it’s recommended that the video decoder perform decompression in real time.

## Declaration

```swift
let kVTDecompressionPropertyKey_RealTime: CFString
```

## Discussion

Discussion For non-realtime decompression, clients may set this property to kCFBooleanFalse, which indicates that it is OK to run this decode pipeline at a lower priority than is used for realtime decoding. By default, VideoToolbox will treat the decompression session as though it is being used for realtime playback (kCFBooleanTrue).  Setting the property to NULL is equivalent to setting it to kCFBooleanTrue.

## See Also

### Decoder Behavior

- [kVTDecompressionProperty_TemporalLevelLimit](videotoolbox/kvtdecompressionproperty_temporallevellimit.md)
- [kVTDecompressionPropertyKey_AllowBitstreamToChangeFrameDimensions](videotoolbox/kvtdecompressionpropertykey_allowbitstreamtochangeframedimensions.md)
- [kVTDecompressionPropertyKey_DeinterlaceMode](videotoolbox/kvtdecompressionpropertykey_deinterlacemode.md)
- [kVTDecompressionPropertyKey_FieldMode](videotoolbox/kvtdecompressionpropertykey_fieldmode.md)
- [kVTDecompressionPropertyKey_MaximizePowerEfficiency](videotoolbox/kvtdecompressionpropertykey_maximizepowerefficiency.md)
- [kVTDecompressionPropertyKey_OnlyTheseFrames](videotoolbox/kvtdecompressionpropertykey_onlytheseframes.md)
- [kVTDecompressionPropertyKey_PixelFormatsWithReducedResolutionSupport](videotoolbox/kvtdecompressionpropertykey_pixelformatswithreducedresolutionsupport.md)
- [kVTDecompressionPropertyKey_ReducedCoefficientDecode](videotoolbox/kvtdecompressionpropertykey_reducedcoefficientdecode.md)
- [kVTDecompressionPropertyKey_ReducedFrameDelivery](videotoolbox/kvtdecompressionpropertykey_reducedframedelivery.md)
- [kVTDecompressionPropertyKey_ReducedResolutionDecode](videotoolbox/kvtdecompressionpropertykey_reducedresolutiondecode.md)
- [kVTDecompressionPropertyKey_SuggestedQualityOfServiceTiers](videotoolbox/kvtdecompressionpropertykey_suggestedqualityofservicetiers.md)
- [kVTDecompressionPropertyKey_SupportedPixelFormatsOrderedByPerformance](videotoolbox/kvtdecompressionpropertykey_supportedpixelformatsorderedbyperformance.md)
- [kVTDecompressionPropertyKey_SupportedPixelFormatsOrderedByQuality](videotoolbox/kvtdecompressionpropertykey_supportedpixelformatsorderedbyquality.md)
- [kVTDecompressionPropertyKey_ThreadCount](videotoolbox/kvtdecompressionpropertykey_threadcount.md)