---
title: Duration
framework: quicktime-file-format
role: symbol
role_heading: Data field
path: quicktime-file-format/track_header_atom/duration
---

# Duration

A time value that indicates the duration of this track, in the movie’s time coordinate system.

## Overview

Overview Note that this property is derived from the track’s edits. The value of this field is equal to the sum of the durations of all of the track’s edits. If there is no edit list, then the duration is the sum of the sample durations, converted into the movie timescale.

## See Also

### Data fields

- [Size](quicktime-file-format/track_header_atom/size.md)
- [Type](quicktime-file-format/track_header_atom/type.md)
- [Version](quicktime-file-format/track_header_atom/version.md)
- [Flags](quicktime-file-format/track_header_atom/flags.md)
- [Creation time](quicktime-file-format/track_header_atom/creation_time.md)
- [Modification time](quicktime-file-format/track_header_atom/modification_time.md)
- [Track ID](quicktime-file-format/track_header_atom/track_id.md)
- [Reserved](quicktime-file-format/track_header_atom/reserved.md)
- [Reserved](quicktime-file-format/track_header_atom/reserved_2.md)
- [Layer](quicktime-file-format/track_header_atom/layer.md)
- [Alternate group](quicktime-file-format/track_header_atom/alternate_group.md)
- [Volume](quicktime-file-format/track_header_atom/volume.md)
- [Reserved](quicktime-file-format/track_header_atom/reserved_3.md)
- [Matrix structure](quicktime-file-format/track_header_atom/matrix_structure.md)
- [Track width](quicktime-file-format/track_header_atom/track_width.md)