---
title: "Bit rate atom ('btrt')"
framework: quicktime-file-format
role: symbol
role_heading: Atom
path: quicktime-file-format/bit_rate_atom
---

# Bit rate atom ('btrt')

An atom that signals the bit rate information of a stream.

## Overview

Overview The optional bit rate atom may be present at the end of any timed metadata sample description to signal the bit rate information of a stream. The bit rate information can be used for buffer configuration. The layout of a bit rate atom is as follows:  |   |   |   |   |   |

## Topics

### Data fields

- [Size](quicktime-file-format/bit_rate_atom/size.md)
- [Type](quicktime-file-format/bit_rate_atom/type.md)
- [Buffer size](quicktime-file-format/bit_rate_atom/buffer_size.md)
- [Max bit rate](quicktime-file-format/bit_rate_atom/max_bit_rate.md)
- [Average bit rate](quicktime-file-format/bit_rate_atom/average_bit_rate.md)

## See Also

### Describing timed metadata

- [Metadata key table atom ('keys')](quicktime-file-format/metadata_key_table_atom.md)
- [Metadata key atom](quicktime-file-format/metadata_key_atom.md)
- [Metadata key declaration atom ('keyd')](quicktime-file-format/metadata_key_declaration_atom.md)
- [Metadata datatype definition atom ('dtyp')](quicktime-file-format/metadata_datatype_definition_atom.md)
- [Metadata locale atom ('loca')](quicktime-file-format/metadata_locale_atom.md)