The edits atom contains an edits list atom ( 'elst' ). Edit lists can be used for hint tracks as they can for any other track type.
The fields of the edits list atom ( 'elst' ) are used as follows:
The flags field is not used, and should be set to 0.
The numEntries field is the number of list entries. Unless the hint track has been edited, it will have either 1 or 2 entries.
Each list entry consists of a duration, a media time, and a rate.
If the track should begin playing after the movie begins, there is an "empty edit" whose duration is the amount of time that passes until the track begins playing, whose media time is -1, and whose media rate is 1. No data should be sent for this track until the number of movie time units specified by the duration field has passed.
Whether or not there is an empty edit, there will typically be one entry whose duration is the media duration in movie timescale units, whose media time is 0, and whose rate is 1.
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