---
title: Part-ID
framework: quicktime-file-format
role: symbol
role_heading: Data field
path: quicktime-file-format/track_profile_atom/part-id
---

# Part-ID

A 32-bit field that defines the feature as being either brand-specific or universal.

## Overview

Overview The second field is the part-ID, which defines the feature as being either brand-specific or universal. Brand-specific features are particular to a specific brand. Universal features can be found in any file type that uses the profile atom. Universal features have a part-ID of four ASCII spaces (0x20202020). Brand-specific features have a part-ID that is one of the compatible brand codes for that file type, as specified in the file type atom ('ftyp'). For example, the part-ID for QuickTime-specific features is 'qt '. All features described in this documentation, however, are universal.

## See Also

### Data fields

- [Reserved](quicktime-file-format/track_profile_atom/reserved.md)
- [Feature code](quicktime-file-format/track_profile_atom/feature_code.md)
- [Value](quicktime-file-format/track_profile_atom/value.md)