---
title: Data format
framework: quicktime-file-format
role: symbol
role_heading: Data field
path: quicktime-file-format/hint_track_sample_description/data_format
---

# Data format

A four-character code indicating the data format of the hint track samples.

## Overview

Overview Only 'rtp ' is currently defined. Note that the fourth character in 'rtp ' is an ASCII blank space (0x20). Do not attempt to packetize data whose format you do not recognize.

## See Also

### Data fields

- [Size](quicktime-file-format/hint_track_sample_description/size.md)
- [Reserved](quicktime-file-format/hint_track_sample_description/reserved.md)
- [Data reference index](quicktime-file-format/hint_track_sample_description/data_reference_index.md)
- [Hint track version](quicktime-file-format/hint_track_sample_description/hint_track_version.md)
- [Last compatible hint track version](quicktime-file-format/hint_track_sample_description/last_compatible_hint_track_version.md)
- [Max packet size](quicktime-file-format/hint_track_sample_description/max_packet_size.md)
- [Additional data table](quicktime-file-format/hint_track_sample_description/additional_data_table.md)