---
title: unknown
framework: coremediaio
role: symbol
role_heading: Type Property
path: coremediaio/cmioextensionstream/discontinuityflags/unknown
---

# unknown

A flag that indicates a stream discontinuity due to an unknown reason.

## Declaration

```swift
static var unknown: CMIOExtensionStream.DiscontinuityFlags { get }
```

## See Also

### Discontinuity Flags

- [time](coremediaio/cmioextensionstream/discontinuityflags/time.md)
- [sampleDropped](coremediaio/cmioextensionstream/discontinuityflags/sampledropped.md)