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# Feature entries

A list of feature entries.

## Overview

Each feature entry consists of:

- `reserved`: A 32-bit field that must be set to zero.
- `part-ID`: Either a brand identifier that occurs in the file-type atom of the same file, indicating a feature that is specific to this brand, or the value `0x20202020` (four ASCII spaces) indicating a universal feature that can be found in any file type that allows the profile atom. The value 0 is reserved for an empty slot.
- `feature-code`: A four-character code either documented here (universal features), or in the specification identified by the brand. The value of `0` is reserved for an empty slot with no meaningful feature-value.
- `feature-value`: Either a value from an enumerated set (for example, `1` or `0` for `true` or `false`, or an MPEG-4 profile-level ID) or a value that can compared (for example, bit rate as an integer or dimensions as a 32-bit packed structure).

The following table shows the layout of a typical feature.

|Data field                  |Bytes|
|----------------------------|-----|
|Reserved = `0x00000000`     |4    |
|Part ID = ’ ’ (`0x20202020`)|4    |
|Feature code = `'avbr'`     |4    |
|Value = `0x00000001`        |4    |

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