---
title: "Track exclude from autoselection atom ('txas')"
framework: quicktime-file-format
role: symbol
role_heading: Atom
path: quicktime-file-format/track_exclude_from_autoselection_atom
---

# Track exclude from autoselection atom ('txas')

An atom that indicates not to automatically select this track.

## Mentioned in

QuickTime File Format change log

## Overview

Overview Some alternate tracks contain something other than a direct translation (or untranslated written form) of the primary content. Commentary tracks are one example. Don’t automatically select these tracks. The presence of the Track Exclude From Autoselection atom in a track indicates not to automatically select this track. Ensure that such tracks have user-readable names that help users to identify the purpose of the track. These names are stored in one or more track name ('tnam') atoms, each translated into a different language, within a user data ('udta') atom within the 'trak' atom. The type of the Track Exclude From Autoselection atom is 'txas'. This atom, if used, must be somewhere after the 'tkhd' atom.

## Topics

### Data fields

- [Size](quicktime-file-format/track_exclude_from_autoselection_atom/size.md)
- [Type](quicktime-file-format/track_exclude_from_autoselection_atom/type.md)

## See Also

### Describing tracks

- [Track atom ('trak')](quicktime-file-format/track_atom.md)
- [Track header atom ('tkhd')](quicktime-file-format/track_header_atom.md)
- [Track aperture mode dimension atoms](quicktime-file-format/track_aperture_mode_dimension_atoms.md)
- [Clipping atom ('clip')](quicktime-file-format/clipping_atom.md)
- [Clipping region atom ('crgn')](quicktime-file-format/clipping_region_atom.md)
- [Track matte atom ('matt')](quicktime-file-format/track_matte_atom.md)
- [Compressed matte atom ('kmat')](quicktime-file-format/compressed_matte_atom.md)
- [Edit atom ('edts')](quicktime-file-format/edit_atom.md)
- [Edit list atom ('elst')](quicktime-file-format/edit_list_atom.md)
- [Playing with edit lists](quicktime-file-format/playing_with_edit_lists.md)
- [Track load settings atom ('load')](quicktime-file-format/track_load_settings_atom.md)
- [Track reference atoms](quicktime-file-format/track_reference_atoms.md)
- [Track input map atoms](quicktime-file-format/track_input_map_atoms.md)