[Bug 639055] discoverer: add support for subtitle streams

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=639055
  GStreamer | gst-plugins-base | git

--- Comment #13 from Vincent Penquerc'h <vincent.penquerch at collabora.co.uk> 2011-08-25 08:35:25 UTC ---
> Why don't you use the GstTagList API here? If there are multiple language tags
> in that tag list it will be stored as an array, not a string, and you might
> want to get the first one only then

I don't know :)
I just copied the block from the existing audio and video cases, I don't know
the rationale for using that API.
Shall I change it anyway ?

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