---
title: "AVC decoder configuration atom ('avcC')"
framework: quicktime-file-format
role: symbol
role_heading: Atom
path: quicktime-file-format/avc_decoder_configuration_atom
---

# AVC decoder configuration atom ('avcC')

A required extension to the video sample description for H.264 video.

## Overview

Overview This atom contains an MPEG-4 decoder configuration atom. This is a required extension to the video sample description for H.264 video. This extension appears in video sample descriptions only when the codec type is ‘avc1’. note: The decoder configuration record that this atom contains is defined in the MPEG-4 specification ISO/IEC FDIS 14496-15.

## Topics

### Data fields

- [Size](quicktime-file-format/avc_decoder_configuration_atom/size.md)
- [Type](quicktime-file-format/avc_decoder_configuration_atom/type.md)
- [AVC decoder configuration record](quicktime-file-format/avc_decoder_configuration_atom/avc_decoder_configuration_record.md)

## See Also

### Extending video sample descriptions

- [Pixel aspect ratio ('pasp')](quicktime-file-format/pixel_aspect_ratio.md)
- [MPEG-4 elementary stream descriptor atom ('esds')](quicktime-file-format/mpeg-4_elementary_stream_descriptor_atom.md)
- [Color parameter atom ('colr')](quicktime-file-format/color_parameter_atom.md)
- [Clean aperture ('clap')](quicktime-file-format/clean_aperture.md)