---
title: Video sample description extensions
framework: quicktime-file-format
role: collectionGroup
role_heading: API Collection
path: quicktime-file-format/video_sample_description_extensions
---

# Video sample description extensions

Extend video sample descriptions by appending other atoms.

## Overview

Overview These atoms are placed after the color table, if one is present. These extensions to the sample description may contain display hints for the decompressor or may simply carry additional information associated with the images. The following table lists the currently defined extensions to video sample descriptions.  |   |   |   |   |   |   |   |   |   |

## Topics

### 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)
- [AVC decoder configuration atom ('avcC')](quicktime-file-format/avc_decoder_configuration_atom.md)
- [Color parameter atom ('colr')](quicktime-file-format/color_parameter_atom.md)
- [Clean aperture ('clap')](quicktime-file-format/clean_aperture.md)

## See Also

### Storing video data

- [Video sample description ('stsd')](quicktime-file-format/video_sample_description.md)
- [Video sample data](quicktime-file-format/video_sample_data.md)