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| This section documents the track-reference types, which link tracks with relationships between them. The link is typed with a code. These codes are documented here.
ISO Family code points (see below for QuickTime code points) |
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| Code | Abstract | Defined in/by |
| avcp | AVC parameter set stream link | AVC |
| cdsc | this track describes the referenced track. | MPEG-4 |
| dpnd | this track has an MPEG-4 dependency on the referenced track | MPEG-4 |
| hint | links hint track to original media track | ISO |
| ipir | this track contains IPI declarations for the referenced track | MPEG-4 |
| mpod | this track is an OD track which uses the referenced track as an included elementary stream track | MPEG-4 |
| sync | this track uses the referenced track as its synchronization source. | MPEG-4 |
| Code | Abstract | Defined in/by |
| chap | Chapter or scene list. Usually references a text track. | QT |
| scpt | Transcript. Usually references a text track. | QT |
| ssrc | Nonprimary source. Indicates that the referenced track should send its data to this track, rather than presenting it. | QT |
| tmcd | Time code. Usually references a time code track. | QT |