---
title: MPEG-1 media
framework: quicktime-file-format
role: article
role_heading: Article
path: quicktime-file-format/mpeg-1_media
---

# MPEG-1 media

Store MPEG-1 video streams, MPEG-1, layer 2 audio streams, and multiplexed MPEG-1 audio and video streams in QuickTime movies.

## Overview

Overview MPEG-1 media is used to store MPEG-1 video streams, MPEG-1, layer 2 audio streams, and multiplexed MPEG-1 audio and video streams in QuickTime movies. It has a media type of 'MPEG'. MPEG-1 Sample Description The MPEG-1 sample description uses the standard sample description header, as described in Sample description atom ('stsd'). The data format field in the sample description is always set to 'MPEG'. The MPEG-1 media handler adds no additional fields to the sample description. note: This data format is not used for MPEG-1, layer 3 audio, however (see MPEG-1 Layer 3 (MP3) Codecs in Sound sample data). MPEG-1 Sample Data Each sample in an MPEG-1 media is an entire MPEG-1 stream. This means that a single MPEG-1 sample may be several hundred megabytes in size. The MPEG-1 encoding used by QuickTime corresponds to the ISO standard, as described in ISO document CD 11172.

## See Also

### Video and sound

- [Video media](quicktime-file-format/video_media.md)
- [Sound media](quicktime-file-format/sound_media.md)
- [Music media](quicktime-file-format/music_media.md)
- [Movie media](quicktime-file-format/movie_media.md)
- [Defining media data layouts](quicktime-file-format/appendix_b_defining_media_data_layouts.md)