[Bug 661171] New: gst-discoverer should not merge tags with different contents from different streams

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=661171
  GStreamer | gst-plugins-base | git

           Summary: gst-discoverer should not merge tags with different
                    contents from different streams
    Classification: Platform
           Product: GStreamer
           Version: git
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-base
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: vincent.penquerch at collabora.co.uk
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


It is common for a stream to have substreams in different languages - mostly
for audio and subtitles. All the language tags will be merged into one (and the
contents of a random (from the user's pov) one will be used).
As seen below, this is also the case for things like bitrate, encoder, etc.

Topology:
  container: Ogg
    subtitles: Kate subtitle format
    subtitles: Kate subtitle format
    audio: Vorbis
    audio: Vorbis
    video: Theora

Properties:
  Duration: 1:54:16.840000000
  Seekable: yes
  Tags: 
      container format: Ogg
      encoder: Xiph.Org libTheora I 20071025 3 2 1
      title: Title 5 - Main Feature
      comment: Created with thoggen: http://thoggen.net
      language code: ja
      encoder version: 0
      nominal bitrate: 128000
      bitrate: 128000
      audio codec: Vorbis
      video codec: Theora
      application name: kateenc - libkate 0.4.0 (Tiger)
      subtitle codec: Kate

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