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

[GStreamer (GNOME Bugzilla)]

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

--- Comment #42 from Chris Bass <floobleflam at gmail.com> ---
Each sample should be a whole document, but that doesn't mean that each timed
element in the input document should be split out into its own document/sample:
You could, for instance, take that whole input document and put it in a single
sample in the mp4 file.

If you were splitting the input file into fixed duration (e.g., 5s) segments
for DASH, you can put all the timed elements occuring in the period 0s-5s into
a single EBU-TT-D file, and that file would go into a single sample in the
corresponding mp4 segment (and so on for the other segments). In other words,
the most efficient method is for each mp4 file in a DASH stream to contain a
single sample, which holds a single EBU-TT-D file that contains all the
elements that will be displayed in that period of the presentation.

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