---
title: "Closed captioning sample data ('cdat')"
framework: quicktime-file-format
role: symbol
role_heading: Atom
path: quicktime-file-format/closed_captioning_sample_data
---

# Closed captioning sample data ('cdat')

A sequence of one or more atoms that store closed captioning sample data.

## Overview

Overview The format of the closed captioning sample data is a sequence of one or more atoms, one of which must be a 'cdat' atom. Unrecognized atoms should be ignored.

## Topics

### Data fields

- [Size](quicktime-file-format/closed_captioning_sample_data/size.md)
- [Type](quicktime-file-format/closed_captioning_sample_data/type.md)
- [Sample data](quicktime-file-format/closed_captioning_sample_data/sample_data.md)

## See Also

### Storing closed captioning

- [Closed captioning sample description](quicktime-file-format/closed_captioning_sample_description.md)
- [Including multiple closed-caption tracks](quicktime-file-format/including_multiple_closed-caption_tracks.md)