QuickTime Streaming
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Hint tracks are atoms of type 'trak' . A hint track atom contains a track header atom ( 'tkhd' ), an edits atom ( 'edts' ), a track reference atom ( 'tref' ), a media atom ( 'mdia' ), and usually a track user data atom ( 'udta' ). The atoms are normally present in the order described, but this is not a requirement. Most of these atoms have child atoms. An expanded diagram of a typical hint track atom is shown below
A detailed description of each atom's contents follows. This document focuses on atom contents that are specific to hint tracks. Refer to the QuickTime File Format documentation for generic information about the structure and contents of the atom types found in track atoms.
Note that the actual hint samples are not part of the hint track atom structure. The hint track atom structure contains the information you need to locate and interpret the samples. A description of hint samples follows the description of the hint track's atoms.
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