---
title: Track input map atoms
framework: quicktime-file-format
role: collectionGroup
role_heading: API Collection
path: quicktime-file-format/track_input_map_atoms
---

# Track input map atoms

Atoms that define how data being sent to this track from its nonprimary sources is to be interpreted.

## Overview

Overview Track input map atoms define how data being sent to this track from its nonprimary sources is to be interpreted. Track references of type 'ssrc' define a track’s secondary data sources. These sources provide additional data that is to be used when processing the track. Track input map atoms have an atom type value of 'imap'.

## Topics

### Atoms for track input

- [Track input map atom ('imap')](quicktime-file-format/track_input_map_atom.md)
- [Track input atom ('  in')](quicktime-file-format/track_input_atom.md)
- [Input type atom ('  ty')](quicktime-file-format/input_type_atom.md)
- [Object ID atom ('obid')](quicktime-file-format/object_id_atom.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 exclude from autoselection atom ('txas')](quicktime-file-format/track_exclude_from_autoselection_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)