- From: <bugzilla@jessica.w3.org>
- Date: Thu, 23 Aug 2012 01:30:23 +0000
- To: public-texttracks@w3.org
https://www.w3.org/Bugs/Public/show_bug.cgi?id=18657
Summary: WebVTT: add file-wide default kind specification
Product: TextTracks CG
Version: unspecified
Platform: PC
OS/Version: All
Status: NEW
Severity: normal
Priority: P2
Component: WebVTT
AssignedTo: ian@hixie.ch
ReportedBy: silviapfeiffer1@gmail.com
QAContact: dave.null@w3.org
CC: mike@w3.org, public-texttracks@w3.org
Blocks: 15851
The Web browser determines via the @kind attribute on the <track> element for a
given WebVTT file the cue payload type [1] and can, as a consequence, go ahead
and render the WebVTT file in different manners (e.g. as subtitles,
descriptions, or chapters).
[1] http://dev.w3.org/html5/webvtt/#cue-payload
When the WebVTT file is delieverd together with a video, but without the HTML
file that provides the <video> and <track> glue, this cue payload information
is lost. This is typically the case for desktop players such as VLC, QuickTime
player, Windows Media Player etc.
To deliver a default @kind mapping, I suggest we introduce a file-wide metadata
header as discussed in bug 15851.
A simple name-value metadata field is sufficient such as:
Kind=Captions
This provides the default cue payload mapping for the WebVTT file.
If such a file is delievered to a HTML page through a <track> element, the
<track> element's @kind attribute would still be the cue payload interpretation
for the Web page.
It is possible to make the WebVTT metadata field the default setting for the
browser, too, in case no @kind attribute is given. But it's also ok if the
browser would just completely ignore this WebVTT metadata field and continue to
use "subtitle" as the default @kind value.
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Received on Thursday, 23 August 2012 01:30:25 UTC