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[Bug 14104] New: Video: Streaming text support in track element

From: <bugzilla@jessica.w3.org>
Date: Sun, 11 Sep 2011 15:02:30 +0000
To: public-html-bugzilla@w3.org
Message-ID: <bug-14104-2486@http.www.w3.org/Bugs/Public/>
http://www.w3.org/Bugs/Public/show_bug.cgi?id=14104

           Summary: Video: Streaming text support in track element
           Product: HTML WG
           Version: unspecified
          Platform: PC
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: HTML5 spec (editor: Ian Hickson)
        AssignedTo: ian@hixie.ch
        ReportedBy: silviapfeiffer1@gmail.com
         QAContact: public-html-bugzilla@w3.org
                CC: mike@w3.org, public-html-wg-issue-tracking@w3.org,
                    public-html@w3.org


Several service providers currently provide live captioning through something
called "streaming text". This means that a text file is provided that contains
the captions and the file is grown over time with new cues being appended.

This use case cannot currently be supported by the track element, because the
video element waits to go to ready state until the complete WebVTT file is
loaded and then never re-checks if anything has been added to the WebVTT file.
This approach makes sense for the canned case, but for live streaming text it
won't work.

It would be good to support this use case. There is a fundamental difference
between streaming text and canned text track files in that the first one
provides cues unreliably, while the second one has a fixed and pre-defined list
of cues. Thus, it is probably necessary to put some sort of flag onto streaming
text tracks - maybe a @live attribute or something similar. This would remove
the requirement to wait with ready state for full loading of the WebVTT file
and would require the browser to continue adding cues when the file size
changes.

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Received on Sunday, 11 September 2011 15:02:31 UTC

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