---
title: kVTCompressionPropertyKey_VBVInitialDelayPercentage
framework: videotoolbox
role: symbol
role_heading: Global Variable
path: videotoolbox/kvtcompressionpropertykey_vbvinitialdelaypercentage
---

# kVTCompressionPropertyKey_VBVInitialDelayPercentage

## Declaration

```swift
let kVTCompressionPropertyKey_VBVInitialDelayPercentage: CFString
```

## Discussion

Discussion Initial delay of the VBV model between storing the picture in the VBV buffer model and decoding of that picture, as a percentage of VBV buffer duration. This value should be specified as a number in the range of 0 to 100. Larger value increases the delay but results in smoother playback. Default value is 90, meaning 90% of the VBV buffer duration. This property key is incompatible with: kVTCompressionPropertyKey_AverageBitRate, kVTCompressionPropertyKey_DataRateLimits, VTVideoEncoderSpecification_EnableLowLatencyRateControl=True.

## See Also

### Rate Control

- [kVTCompressionPropertyKey_AverageBitRate](videotoolbox/kvtcompressionpropertykey_averagebitrate.md)
- [kVTCompressionPropertyKey_ConstantBitRate](videotoolbox/kvtcompressionpropertykey_constantbitrate.md)
- [kVTCompressionPropertyKey_DataRateLimits](videotoolbox/kvtcompressionpropertykey_dataratelimits.md)
- [kVTCompressionPropertyKey_EstimatedAverageBytesPerFrame](videotoolbox/kvtcompressionpropertykey_estimatedaveragebytesperframe.md)
- [kVTCompressionPropertyKey_MoreFramesAfterEnd](videotoolbox/kvtcompressionpropertykey_moreframesafterend.md)
- [kVTCompressionPropertyKey_MoreFramesBeforeStart](videotoolbox/kvtcompressionpropertykey_moreframesbeforestart.md)
- [kVTCompressionPropertyKey_Quality](videotoolbox/kvtcompressionpropertykey_quality.md)
- [kVTCompressionPropertyKey_TargetQualityForAlpha](videotoolbox/kvtcompressionpropertykey_targetqualityforalpha.md)
- [kVTCompressionPropertyKey_VariableBitRate](videotoolbox/kvtcompressionpropertykey_variablebitrate.md)
- [kVTCompressionPropertyKey_VBVBufferDuration](videotoolbox/kvtcompressionpropertykey_vbvbufferduration.md)
- [kVTCompressionPropertyKey_VBVMaxBitRate](videotoolbox/kvtcompressionpropertykey_vbvmaxbitrate.md)