---
title: Closed captioning media
framework: quicktime-file-format
role: collectionGroup
role_heading: API Collection
path: quicktime-file-format/closed_captioning_media
---

# Closed captioning media

Store closed captioning for QuickTime movies.

## Overview

Overview A closed caption media track contains text data used for closed captioning in QuickTime movies. It has a media type of 'clcp'. Closed captions are used to display the audio portions of a movie as text. They transcribe dialog and indicate other sounds. Other tracks can identify this track as being a related closed captioning track by using the 'clcp' track reference to refer to this track. Like other media data tracks, a closed caption track should include a language code and an extended language tag atom.

## Topics

### Storing closed captioning

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

## See Also

### Text, captions, and subtitles

- [Text media](quicktime-file-format/text_media.md)
- [Subtitle media](quicktime-file-format/subtitle_media.md)