[Bug 797072] discoverer: Consider closedcaption/ as subtitles and improve subtitle caps detection

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=797072

--- Comment #1 from Sebastian Dröge (slomo) <slomo at coaxion.net> ---
Created attachment 373546
  --> https://bugzilla.gnome.org/attachment.cgi?id=373546&action=edit
discoverer: Consider closedcaption/ as subtitles and improve subtitle caps
detection

Generally all subtitle/, subpicture/, text/, closedcaption/ and
application/x-subtitle caps instead of hardcoding a small set of caps.

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