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# MTRegisterProfessionalVideoWorkflowFormatReaders()

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

```
func MTRegisterProfessionalVideoWorkflowFormatReaders()
```

## Overview

Call this function to indicate to Media Toolbox that your app requires support for <doc://com.apple.documentation/documentation/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 <doc://com.apple.documentation/documentation/UniformTypeIdentifiers/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).

---

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