[Bug 692431] New: Setting tags doesn't seem to work very well

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=692431
  GStreamer | gst-plugins-base | 1.x

           Summary: Setting tags doesn't seem to work very well
    Classification: Platform
           Product: GStreamer
           Version: 1.x
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gst-plugins-base
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: Uraeus at linuxrising.org
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


I have the following code in Transmageddon for trying to set some tags. I have
noticed that the TAG_APPLICATION_NAME tag gets set in Quicktime container, but
the TAG_LANGUAGE_CODE doesn't seem to be set in any format I tried (Vorbis,
WebM and Quicktime). 

   def OnEncodebinElementAdd(self, encodebin, element):
       factory=element.get_factory()
       if factory != None:
           # set multipass cache file on video encoder element
           if (self.multipass != 0) and (self.passcounter == int(0)):
               if Gst.ElementFactory.list_is_type(factory, 2814749767106562): #
this is the factory code for Video encoders
                   element.set_property("multipass-cache-file", self.cachefile)

           # Set Transmageddon as Application name using Tagsetter interface
           tagyes = factory.has_interface("GstTagSetter")
           if tagyes ==True:
               taglist=Gst.TagList.new_empty()
               taglist.add_value(Gst.TagMergeMode.APPEND,
Gst.TAG_APPLICATION_NAME, "Transmageddon transcoder")
               element.merge_tags(taglist, Gst.TagMergeMode.REPLACE)
           if Gst.ElementFactory.list_is_type(factory, 1125899906842626): #
Audio Encoders factory code
                   print("got audio encoder")
                   taglistBANG=Gst.TagList.new_empty()
                   taglistBANG.add_value(Gst.TagMergeMode.APPEND,
Gst.TAG_LANGUAGE_CODE, self.audiodata[0]['language'])  # FIXME: Currently only
doing 1 stream
                   print(self.audiodata[0]['language'])
                   longname=factory.get_metadata('long-name')
                   print(longname)
                   taglistBANG.add_value(Gst.TagMergeMode.APPEND,
Gst.TAG_ENCODER, longname)
                   element.merge_tags(taglistBANG, Gst.TagMergeMode.REPLACE)

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