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[Bug 13358] <video> also fire a 'change' event at VideoTrackList, AudioTrackList, and TextTrackList objects when their list of tracks changes

From: <bugzilla@jessica.w3.org>
Date: Fri, 07 Oct 2011 02:42:37 +0000
To: public-html-bugzilla@w3.org
Message-Id: <E1RC0OT-0002nj-8K@jessica.w3.org>

--- Comment #14 from Ian 'Hixie' Hickson <ian@hixie.ch> 2011-10-07 02:42:30 UTC ---
The issue of tracking when a a particular track has media data and when it does
not is IMHO a separate issue than the issue of tracking whether a particular
track exists and notifying the script when a new track is added to the list.

(I agree that the issue of tracking when a track has data is a real one, though
I haven't yet studied what use cases actually rely on having this knowledge.
For example, sign-language overlay tracks frequently are sparse relative to the
primary video. I could believe that there are use cases that need the ability
to determine during what time regions such a track would be available, but
before determining what API to use to expose this, and how to report changes to
this information, we will need to enumerate the use cases for using the
information in question. This is better done in its own dedicated bug so that
if we e.g. get a revert request or escalation for the original topic of this
bug, we don't have to track multiple issues under the same bug number.)

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