[Bug 702545] tags: xmp: adding tags is very slow

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=702545
  GStreamer | gst-plugins-base | 0.10.35

--- Comment #3 from Edward Hervey <bilboed at gmail.com> 2013-06-19 07:00:57 UTC ---
My bad, it's actually gst_value_list_merge which is the most expensive part
(called by gst_value_list_add(TAG_MERGE_MORE_APPEND|PREPEND) :(

It actually creates ... a new valuelist from the existing one and the new one
... which becomes exponentially more expensive as you add items.

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