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qtmux: Add a comment about how atom_trak_set_elst_entry() works

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This commit is contained in:
Jan Schmidt 2017-02-09 11:29:43 +11:00
parent c7aa449e58
commit 2987e66f22
1 changed files with 4 additions and 0 deletions
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4
gst/isomp4/gstqtmux.c
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@ -2552,6 +2552,10 @@ gst_qt_mux_update_edit_lists (GstQTMux * qtmux)
media_start = gst_util_uint64_scale_round (ctts,
atom_trak_get_timescale (qtpad->trak), GST_SECOND);
/* atom_trak_set_elst_entry() has a quirk - if the edit list
* is empty because there's no gap added above, this call
* will not replace index 1, it will create the entry at index 0.
* Luckily, that's exactly what we want here */
atom_trak_set_elst_entry (qtpad->trak, 1, duration, media_start,
(guint32) (1 * 65536.0));
}