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[Bug 25132] New: Update the "sourcing in-band text tracks" section for different types of text tracks

From: <bugzilla@jessica.w3.org>
Date: Mon, 24 Mar 2014 06:00:12 +0000
To: public-html-admin@w3.org
Message-ID: <bug-25132-2495@http.www.w3.org/Bugs/Public/>
https://www.w3.org/Bugs/Public/show_bug.cgi?id=25132

            Bug ID: 25132
           Summary: Update the "sourcing in-band text tracks" section for
                    different types of text tracks
           Product: WHATWG
           Version: unspecified
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: HTML
          Assignee: ian@hixie.ch
          Reporter: silviapfeiffer1@gmail.com
        QA Contact: contributor@whatwg.org
                CC: b.lund@cablelabs.com,
                    cyril.concolato@telecom-paristech.fr,
                    hbbtvjon@gmail.com, mike@w3.org, philipj@opera.com,
                    public-html-admin@w3.org, silviapfeiffer1@gmail.com
        Depends on: 24997

Expand on how to source TextTrack objects from types of inband text tracks
typically used in UAs, given input from the Inband Text Track CG. This
includes:

1. Determining what tracks in a media resource are actually identified as text
tracks

2. The order in which the identified tracks are added to the TextTrackList

3. How to fill the .id, .kind, .label, and .language attributes on the created
TextTrack object (these are actually applicable to AudioTrack and Video Track
objects, too)

The proposed patch is here:
https://github.com/w3c/html/commit/5fbd9199cc711d8ae9155da58be3d4368272e00d .

The Inband Text Track CG has collated information on their wiki here:
https://www.w3.org/community/inbandtracks/wiki/Main_Page#Audio.2FVideo.2FText_Track_Creation
* "Track order" relates to point 2 above,
* "Track id, label, language" relate to point 3 above,
* "TextTrack Creation - kind" relates to point 1 & 3 above

The specifications that I based the patch on are as follows:

* Ogg (there were some bugs in Ogg and I completed the information):
https://wiki.xiph.org/SkeletonHeaders and
https://www.xiph.org/ogg/doc/framing.html (for skeleton-free Ogg)

* WebM:
http://www.webmproject.org/docs/container/
http://matroska.org/technical/specs/index.html

* MPEG-2:
http://www.itu.int/rec/T-REC-H.222.0-201206-I

* ISOBMFF/MEG-4:
http://standards.iso.org/ittf/PubliclyAvailableStandards/c061988_ISO_IEC_14496-12_2012.zip

* DASH:
http://standards.iso.org/ittf/PubliclyAvailableStandards/c057623_ISO_IEC_23009-1_2012.zip

Where it was unclear, I used the input from the CG wiki.
The patch has been reviewed and ok-ed by the CG (see bug #24997).
I'm looking to have the patch adjusted and applied in a manner that suits the
WHATWG style.

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Received on Monday, 24 March 2014 06:00:18 UTC

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