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[Bug 13622] New: The cue processing algorithm should be able to activate zero-duration cues

From: <bugzilla@jessica.w3.org>
Date: Wed, 03 Aug 2011 19:33:38 +0000
To: public-html@w3.org
Message-ID: <bug-13622-2495@http.www.w3.org/Bugs/Public/>
http://www.w3.org/Bugs/Public/show_bug.cgi?id=13622

           Summary: The cue processing algorithm should be able to
                    activate zero-duration cues
           Product: HTML WG
           Version: unspecified
          Platform: All
        OS/Version: All
            Status: NEW
          Keywords: a11y, a11ytf, media
          Severity: normal
          Priority: P2
         Component: LC1 HTML5 spec (editor: Ian Hickson)
        AssignedTo: ian@hixie.ch
        ReportedBy: mstm@jp.ibm.com
         QAContact: public-html-bugzilla@w3.org
                CC: mike@w3.org, public-html-wg-issue-tracking@w3.org,
                    public-html@w3.org, public-html-a11y@w3.org


Section affected:
http://www.whatwg.org/specs/web-apps/current-work/multipage/the-video-element.html#playing-the-media-resource

In the current cue processing algorithm, a cue whose start time is equal to the
end time never gets into "current cues", which is defined as the list of cues
"whose start times are less than or equal to the current playback position and
whose end times are greater than the current playback position".

However, certain kinds of cues (e.g., extended video descriptions which pause
the playback while presenting a description) require such a zero-duration cue
as the media timeline is defined based on the timeline of the original media
resource. The algorithm should activate even a zero-duration cue at the
specified time.

Once the cue is activated and the corresponding event is fired, the system or a
script will be able to handle it (e.g., pause/resume the playback in the case
of extended descriptions). A use case of extended descriptions is found at:
http://media.w3.org/2010/08/

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Received on Wednesday, 3 August 2011 19:33:42 GMT

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