---
title: "Object ID atom ('obid')"
framework: quicktime-file-format
role: symbol
role_heading: Atom
path: quicktime-file-format/object_id_atom
---

# Object ID atom ('obid')

An atom that identifies an object, such as a sprite within a sprite track, in a track input atom.

## Overview

Overview If the input is operating on an object within the track (for example, a sprite within a sprite track), an object ID atom must be included in the track input atom to identify the object.

## Topics

### Data fields

- [Size](quicktime-file-format/object_id_atom/size.md)
- [Type](quicktime-file-format/object_id_atom/type.md)
- [Object ID](quicktime-file-format/object_id_atom/object_id.md)

## See Also

### 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)