[Athen] Captioning - OGV file format

Pielaet, Jon jon.pielaet at mso.umt.edu
Thu Apr 15 11:38:47 PDT 2010


Thanks for forwarding the links and information on native ogg captioning. Staying open source is always my preference.

I'd like to poll the group on their thoughts about HTML5 video implementations. Apple has build an empire with its' proprietary H.264\MP4 push.
Does Ogg\Theora have a chance? Moving forward, which standard will you support? Open Theora on most platforms or closed H.264 for the iUniverse?

Jon P. Pielaet
Program Assistant for Instructional Materials
Disability Services for Students
Emma B. Lommasson 154
The University of Montana
Missoula, MT 59812


406-243-2243 Voice/Text
406-243-4461 Direct Line
406-243-5330 Fax

-----Original Message-----
From: athen-bounces at athenpro.org [mailto:athen-bounces at athenpro.org] On Behalf Of John Foliot
Sent: Thursday, April 15, 2010 12:08 PM
To: 'Access Technology Higher Education Network'
Subject: Re: [Athen] Captioning - OGV file format

Dawn Hunziker wrote:


> I have a department at the University of Arizona that wants to post .ogv

> video formats on their Website. We are working with Automatic Sync

> Technologies for the captioning of other media files but .ogv is not

> supported. Has any successfully captioned this type of file? If so,

> what steps did you take?

Captioning OGG files is still kind of 'tricky', but certainly worth
investigating further. I might suggest you start here:

Silvia is one of the lead engineers working with Mozilla towards
implementation of the <video> element in HTML5 (which currently does not
specify *how* to include captions, but we're working on it), and is likely
one of the most knowledgeable people I know when it comes to OGG files
(which are already supported in FireFox 3.6, Opera 10.5 and Chrome
browsers using the native HTML5 <video> element.

Moving forward (i.e. hopefully in the near future), captioning for OGG in
HTML5 will require either .SRT files or a profile of .DFXP (.XML)
time-stamp files, and will likely take a pattern along the lines of what
is described here:
http://www.w3.org/WAI/PF/HTML/wiki/Media_TextAssociations (there is also a
proposed JavaScript API for extracting captions bundled inside a media
wrapper such as OGG or H.264 -

PLEASE NOTE: This is very much a work in progress, and like many aspects
of HTML5 is subject to change at any time, so this is for this group's
information only and is NOT a recommended technique at this time. As well,
these particular proposals have not even advanced to the larger HTML5
Working Group at the W3C, but are draft proposals at the Accessibility
Task Force level (for those who care about such things). That said, it's
exciting and promising, and we may even start seeing implementation as
early as this fall, so stand-by for details.

John  Foliot
Program Manager
Stanford Online Accessibility Program
Stanford University
Tel: 650-862-4603

Co-chair HTML5 Accessibility Task Force (Media Sub Group)

Athen mailing list
Athen at athenpro.org

More information about the athen-list mailing list