---
title: streamSinkBuffersRequiredForStartup
framework: coremediaio
role: symbol
role_heading: Type Property
path: coremediaio/cmioextensionproperty/streamsinkbuffersrequiredforstartup
---

# streamSinkBuffersRequiredForStartup

A property key for the number of buffers required for startup.

## Declaration

```swift
static let streamSinkBuffersRequiredForStartup: CMIOExtensionProperty
```

## Discussion

Discussion The property state for this property is a number. The property value matches the value of the kCMIOStreamPropertyOutputBuffersRequiredForStartup property.

## See Also

### Stream Properties

- [streamActiveFormatIndex](coremediaio/cmioextensionproperty/streamactiveformatindex.md)
- [streamFrameDuration](coremediaio/cmioextensionproperty/streamframeduration.md)
- [streamMaxFrameDuration](coremediaio/cmioextensionproperty/streammaxframeduration.md)
- [streamSinkBufferQueueSize](coremediaio/cmioextensionproperty/streamsinkbufferqueuesize.md)
- [streamSinkBufferUnderrunCount](coremediaio/cmioextensionproperty/streamsinkbufferunderruncount.md)
- [streamSinkEndOfData](coremediaio/cmioextensionproperty/streamsinkendofdata.md)