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DASH-IF IOP 2.9 [1] defines how 708 closed captions may be encoded in ISOBMFF and associated MPD metadata. Up date the spec to define how this should be sourced in HTML. [1] http://dashif.org/w/2014/08/DASH-IF-IOP-v2.90.pdf
*** Bug 27306 has been marked as a duplicate of this bug. ***