[Bug 758232] Add support for EBU-TT-D / TTML subtitles

Tue Oct 4 10:03:26 UTC 2016

https://bugzilla.gnome.org/show_bug.cgi?id=758232

--- Comment #40 from Chris Bass <floobleflam at gmail.com> ---
The parser/renderer handle the raw TTML file with no problems. The content of
the mp4 file is not valid EBU-TT-D: in EBU-TT-D <p>s must be contained within a
<div> - they can't be direct children of a <body> element.

Unfortunately, MP4Box is not doing the right thing. It also does other horrible
things, like creating a separate EBU-TT-D document for each timed element
(i.e., each <p> in this case) in the input file, and placing each of these
documents in its own sample within the mp4 file. That means that 90% of the
content of the mp4 file is redundant: all of the contents of the <head> and
most of the other contents of the input file is repeated in each of these
documents.

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