---
title: kVTDecompressionPropertyKey_NumberOfFramesBeingDecoded
framework: videotoolbox
role: symbol
role_heading: Global Variable
path: videotoolbox/kvtdecompressionpropertykey_numberofframesbeingdecoded
---

# kVTDecompressionPropertyKey_NumberOfFramesBeingDecoded

Returns the number of frames currently being decoded.

## Declaration

```swift
let kVTDecompressionPropertyKey_NumberOfFramesBeingDecoded: CFString
```

## Discussion

Discussion This number may decrease asynchronously as frames are output.

## See Also

### Asynchronous State

- [kVTDecompressionPropertyKey_MaxOutputPresentationTimeStampOfFramesBeingDecoded](videotoolbox/kvtdecompressionpropertykey_maxoutputpresentationtimestampofframesbeingdecoded.md)
- [kVTDecompressionPropertyKey_MinOutputPresentationTimeStampOfFramesBeingDecoded](videotoolbox/kvtdecompressionpropertykey_minoutputpresentationtimestampofframesbeingdecoded.md)