Track header atom ('tkhd')

Overview

The track header atom specifies the characteristics of a single track within a movie. A track header atom contains a size field that specifies the number of bytes and a type field that indicates the format of the data (defined by the atom type 'tkhd').

The layout of a track header atom is as follows.

The track header atom contains the track characteristics for the track, including temporal, spatial, and volume information.

Topics

Data fields

• Size
• Type
• Version
• Flags
• Creation time
• Modification time
• Track ID
• Reserved
• Duration
• Reserved
• Layer
• Alternate group
• Volume
• Reserved
• Matrix structure
• Track width
• Track height

See Also

Describing tracks

• Track atom ('trak')
• Track exclude from autoselection atom ('txas')
• Track aperture mode dimension atoms
• Clipping atom ('clip')
• Clipping region atom ('crgn')
• Track matte atom ('matt')
• Compressed matte atom ('kmat')
• Edit atom ('edts')
• Edit list atom ('elst')
• Playing with edit lists
• Track load settings atom ('load')
• Track reference atoms
• Track input map atoms