MP4GetTrackEditTotalDuration - Get the total duration of a sequence of
track edit segments
MP4EditId editId = MP4_INVALID_EDIT_ID
hFile Specifies the mp4 file to which the operation applies.
Specifies the track to which the operation applies.
editId Specifies the edit segment for which the total duration is
desired. A value of MP4_INVALID_EDIT_ID specifies that all edit
segments should be included.
The total duration of the edit segment sequence in track time scale
units of the track in the mp4 file.
MP4GetTrackEditTotalDuration returns the total duration of the
specified sequence of track edit segments from the first edit segment
up to and including the specified edit segment. If the edit id value is
MP4_INVALID_EDIT_ID, then the total duration of all of the edit
segments is returned.
Caveat: The value is in units of the track time scale.