[Bug 623653] [playbin2] Only handle supported subtitle/subpicture caps as raw

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=623653
  GStreamer | gst-plugins-base | git

Bug 623653 depends on bug 623655, which changed state.

Bug 623655 Summary: [uridecodebin] Problems with handling of non-raw sources with multiple srcpads (resindvdbin)
https://bugzilla.gnome.org/show_bug.cgi?id=623655

           What    |Old Value                   |New Value
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|                            |OBSOLETE

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