[Bug 690358] New: empty string on taglist field warning when trying to discover mkv file

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=690358
  GStreamer | gst-plugins-good | 1.x

           Summary: empty string on taglist field warning when trying to
                    discover mkv file
    Classification: Platform
           Product: GStreamer
           Version: 1.x
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gst-plugins-good
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: mail at jensge.org
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


Well, here you go:

File is
http://blender-mirror.kino3d.org/mango/download.blender.org/demo/movies/ToS/tears_of_steel_1080p.mkv

gst-discoverer-1.0 file:///home/jens/Videos/tears_of_steel_1080p.mkv
Analyzing file:///home/jens/Videos/tears_of_steel_1080p.mkv

(gst-discoverer-1.0:14749): GStreamer-WARNING **: Trying to set empty string on
taglist field 'title'. Please file a bug.

(gst-discoverer-1.0:14749): GStreamer-WARNING **: Trying to set empty string on
taglist field 'artist'. Please file a bug.

(gst-discoverer-1.0:14749): GStreamer-WARNING **: Trying to set empty string on
taglist field 'composer'. Please file a bug.

(gst-discoverer-1.0:14749): GStreamer-WARNING **: Trying to set empty string on
taglist field 'genre'. Please file a bug.
Done discovering file:///home/jens/Videos/tears_of_steel_1080p.mkv

Topology:
  container: Matroska
    audio: MPEG-4 AAC
    video: Theora

Properties:
  Duration: 0:12:14.166687500
  Seekable: yes
  Tags: 
      extended comment: SYNOPSIS=
      date: 1901-01-01
      container format: Matroska
      audio codec: MPEG-4 AAC audio
      language code: en
      encoder: Xiph.Org libtheora 1.1 20090822 (Thusnelda)
      encoder version: 3
      video codec: Theora
      bitrate: 6100000
      nominal bitrate: 6100000


Backtrace for first warning:

#0  g_logv (log_domain=0x7ffff796eea8 "GStreamer",
log_level=G_LOG_LEVEL_WARNING, format=0x7ffff79849a0 "Trying to set empty
string on taglist field '%s'. Please file a bug.", args=0x7ffff376e4f8) at
gmessages.c:853
#1  0x00007ffff739bfd2 in g_log (log_domain=<optimized out>,
log_level=<optimized out>, format=<optimized out>) at gmessages.c:1003
#2  0x00007ffff79407b7 in gst_structure_set_field (structure=0x7fffe403a340,
field=0x7ffff376e610) at gststructure.c:784
#3  0x00007ffff794210e in gst_structure_id_set_value_internal
(value=0x7ffff376e840, field=428, structure=0x7fffe403a340) at
gststructure.c:470
#4  gst_structure_id_set_value (structure=0x7fffe403a340, field=428,
value=0x7ffff376e840) at gststructure.c:492
#5  0x00007ffff7947aee in gst_tag_list_add_value_internal (tag_list=<optimized
out>, mode=GST_TAG_MERGE_APPEND, tag=<optimized out>, value=0x7ffff376e840,
info=0x613a70) at gsttaglist.c:1054
#6  0x00007ffff794ae57 in gst_tag_list_add_valist_values (list=0x7fffe4002d90,
mode=GST_TAG_MERGE_APPEND, tag=0x7ffff3bc735d "title", var_args=0x7ffff376e6e8)
at gsttaglist.c:1306
#7  0x00007ffff794afea in gst_tag_list_add_values (list=0x7fffe4002d90,
mode=GST_TAG_MERGE_APPEND, tag=0x7ffff3bc735d "title") at gsttaglist.c:1218
#8  0x00007ffff3bbba1f in gst_matroska_read_common_parse_metadata_id_simple_tag
(common=0x7fffec0681b8, ebml=<optimized out>, p_taglist=0x7ffff376e970,
parent=<optimized out>) at matroska-read-common.c:2052
#9  0x00007ffff3bbfa75 in gst_matroska_read_common_parse_metadata_id_tag
(p_taglist=<synthetic pointer>, ebml=0x7ffff376ea10, common=0x7fffec0681b8) at
matroska-read-common.c:2326
#10 gst_matroska_read_common_parse_metadata (common=0x7fffec0681b8,
el=0x7fffec0680b0, ebml=0x7ffff376ea10) at matroska-read-common.c:2445
#11 0x00007ffff3ba4a28 in gst_matroska_demux_parse_id (demux=0x7fffec0680b0,
id=307544935, length=<optimized out>, needed=5) at matroska-demux.c:4314
#12 0x00007ffff3ba79ce in gst_matroska_demux_parse_contents_seekentry
(ebml=0x7ffff376ebd0, demux=0x7fffec0680b0) at matroska-demux.c:3853
#13 gst_matroska_demux_parse_contents (demux=0x7fffec0680b0,
ebml=0x7ffff376ebd0) at matroska-demux.c:3902
#14 0x00007ffff3ba3f25 in gst_matroska_demux_parse_id (demux=0x7fffec0680b0,
id=290298740, length=<optimized out>, needed=5) at matroska-demux.c:4332
#15 0x00007ffff3ba82d7 in gst_matroska_demux_loop (pad=<optimized out>) at
matroska-demux.c:4458
#16 0x00007ffff794dccf in gst_task_func (task=0x7b15a0) at gsttask.c:316
#17 0x00007ffff73b81c8 in g_thread_pool_thread_proxy (data=<optimized out>) at
gthreadpool.c:309
#18 0x00007ffff73b7945 in g_thread_proxy (data=0x7fffec04f320) at gthread.c:798
#19 0x00007ffff7136e9a in start_thread (arg=0x7ffff376f700) at
pthread_create.c:308
#20 0x00007ffff6e63cbd in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#21 0x0000000000000000 in ?? ()

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