[Bug 14104] <track> Live captioning

https://www.w3.org/Bugs/Public/show_bug.cgi?id=14104

--- Comment #28 from Silvia Pfeiffer <silviapfeiffer1@gmail.com> 2011-12-08 00:31:08 UTC ---
(In reply to comment #24)
> Roll-up captions are, as far as I can tell, just one cue, that happens to have
> internal state (much like a karaoke cue, actually).

Roll-up is a means of displaying lines of text. It doesn't matter whether they
are in one cue or in many cues. Text from several cues should be able to be
added to a previous cue and make it roll up.


> The problem with using the current cue concept for live cues is that you don't
> know when the cue will end (which it may well do before the end of the stream,
> e.g. if the live stream has prerecorded segments spliced in, e.g. ads), yet our
> cue format puts the end time before the cue text. Hence the desire for a
> different format for live cues.

Again: let me decouple rollup from this problem, since rollup is a means of
display, not a timing means. I want to focus on the timing issues.

Even cues for which we don't know the end time at the time of their creation,
there is a time when the end time is known. This time is typically the
appearance of another cue. Thus, a cue's end time can be set in relation to the
start time of a future cue.

This is the problem that I tried to solve. It is independent of rollup, because
this may happen with pop-on captions, too.

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Received on Thursday, 8 December 2011 00:31:10 UTC