[Bug 25355] Move TextTrack.inBandMetadataTrackDispatchType to DataCue.type, and make it optional

https://www.w3.org/Bugs/Public/show_bug.cgi?id=25355

--- Comment #8 from Bob Lund <b.lund@cablelabs.com> ---
(In reply to Brendan Long from comment #7)
> (In reply to Aaron Colwell from comment #6)
> > Does this mean that all metadata should be multiplexed into a single
> > "metadata" TextTrack? If not, how is the application expected to select the
> > "right" metadata track for the specific metadata it is interested in?
> 
> I think this is what's being suggested. What I heard from people at Apple
> was that we don't necessarily know what type of metadata we're looking at,
> so maybe it would be better to have separate tracks for each type like we
> have now, and then have some sort of "we don't know what type this is"
> metadata track? I'm not sure that track would ever be useful to web authors
> though.

It seems to be a UA implementation, and perhaps a media container format, issue
whether the type of data in a metadata track is known when the track is
created. In the case where the type is known at track creation, having the type
associated with each Cue in that track works but is sub-optimal.

It also seems that a UA, again perhaps based on media resource format, will
either multiplex all Cue types into a generic metadata text track or it will
create type specific metadata text tracks. I can't construct a use case why
both would be done for a specific media resource instance.

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Received on Thursday, 17 April 2014 20:29:00 UTC