---
title: AVCaptureTimecode.SourceType.external
framework: AVFoundation
role: symbol
role_heading: Case
platforms: [iOS 26.0+, iPadOS 26.0+, Mac Catalyst 26.0+, macOS 26.0+, tvOS 26.0+]
path: avfoundation/avcapturetimecode/sourcetype-swift.enum/external
---

# AVCaptureTimecode.SourceType.external

Synchronizes timecode to an external timecode data stream. Ideal for professional audio and video synchronization with external quarter-frame MIDI or HID timecode hardware.

## Declaration

```swift
case external
```

## See Also

### Source types

- [AVCaptureTimecode.SourceType.frameCount](avfoundation/avcapturetimecode/sourcetype-swift.enum/framecount.md)
- [AVCaptureTimecode.SourceType.realTimeClock](avfoundation/avcapturetimecode/sourcetype-swift.enum/realtimeclock.md)