---
title: kVTCompressionPropertyKey_MaxH264SliceBytes
framework: videotoolbox
role: symbol
role_heading: Global Variable
path: videotoolbox/kvtcompressionpropertykey_maxh264slicebytes
---

# kVTCompressionPropertyKey_MaxH264SliceBytes

The maximum slice size for H.264 encoding.

## Declaration

```swift
let kVTCompressionPropertyKey_MaxH264SliceBytes: CFString
```

## Discussion

Discussion If supported by an H.264 encoder, the value limits the size in bytes of slices produced by the encoder, where possible. By default, no limit is specified.  A value of zero implies default behavior.

## See Also

### Runtime Restrictions

- [kVTCompressionPropertyKey_MaxFrameDelayCount](videotoolbox/kvtcompressionpropertykey_maxframedelaycount.md)
- [kVTCompressionPropertyKey_MaximizePowerEfficiency](videotoolbox/kvtcompressionpropertykey_maximizepowerefficiency.md)
- [kVTCompressionPropertyKey_RealTime](videotoolbox/kvtcompressionpropertykey_realtime.md)