---
title: MTRegisterProfessionalVideoWorkflowFormatReaders()
framework: Media Toolbox
role: symbol
role_heading: Function
platforms: [macOS 10.10+]
path: mediatoolbox/mtregisterprofessionalvideoworkflowformatreaders()
---

# MTRegisterProfessionalVideoWorkflowFormatReaders()

Enables the use of media format readers that support professional video workflows.

## Declaration

```swift
func MTRegisterProfessionalVideoWorkflowFormatReaders()
```

## Overview

Overview Call this function to indicate to Media Toolbox that your app requires support for MediaExtension format readers. note: This functionality is only intended for apps that support professional video workflows. It isn’t recommended for network-facing applications such as web browsers, messaging clients, mail clients, and so on. By convention, format readers registered using this function should conform to the abstract UTTypeReference of com.apple.mediaextension-content which in turn conforms to the abstract type public.movie. You can use com.apple.mediaextension-content to do type filtering (for example in Open… dialogs).