[Bug 705369] New: playbin: fix get-tags actions

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=705369
  GStreamer | gst-plugins-base | 1.1.3

           Summary: playbin: fix get-tags actions
    Classification: Platform
           Product: GStreamer
           Version: 1.1.3
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gst-plugins-base
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: rawoul at gmail.com
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


Created an attachment (id=250733)
 View: https://bugzilla.gnome.org/attachment.cgi?id=250733
 Review: https://bugzilla.gnome.org/review?bug=705369&attachment=250733

playbin: check for tags on the right combiner instance

The get-tags actions are not working in all cases, because the track number is
used to resolve the stream combiner instead of the stream type.

To reproduce just try to retrieve the video tags from a video with no audio.

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