[Bug 28135] Define sourcing for 708 captions in ISOBMFF

https://www.w3.org/Bugs/Public/show_bug.cgi?id=28135

--- Comment #1 from Bob Lund <b.lund@cablelabs.com> ---
*** Bug 27306 has been marked as a duplicate of this bug. ***

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Received on Sunday, 10 May 2015 11:24:59 UTC