[Bug 772835] videooverlaycomposition: Need unref composition when remove video overlay composition meta

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=772835

--- Comment #7 from kevin <kevinbing.song at gmail.com> ---
Below is our code.

  while ((meta = gst_buffer_iterate_meta (src, &state))) {
    if (meta->info->api == GST_VIDEO_OVERLAY_COMPOSITION_META_API_TYPE) {
      compmeta = (GstVideoOverlayCompositionMeta*)meta;
      if (GST_IS_VIDEO_OVERLAY_COMPOSITION (compmeta->overlay)) {
        comp_copy = gst_video_overlay_composition_copy(compmeta->overlay);
        if (comp_copy) {
          gst_buffer_add_video_overlay_composition_meta(dst, comp_copy);
        }
      }
    }
  }

gst_video_overlay_composition_copy() will new comp_copy and
gst_buffer_add_video_overlay_composition_meta() will add one ref. Do you have
any suggestion.

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