[Bug 797111] video-anc: Store width/height for which Closed Caption data was produced in the meta

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=797111

--- Comment #2 from Sebastian Dröge (slomo) <slomo at coaxion.net> ---
Created attachment 373584
  --> https://bugzilla.gnome.org/attachment.cgi?id=373584&action=edit
qtmux: Initialize caption track language code to 0 instead of "und"

Without this, Final Cut considers it "non-standard"

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