- From: geoff freed <geoff_freed@wgbh.org>
- Date: 23 Jan 2002 17:16:29 -0500
- To: <www-tt-tf@w3.org>, "Michael A. Dolan" <miked@tbt.com>, <www-tt-tf-request@w3.org>
WGBH and NCAM (National Center for Accessible Media) are heavily involved in digital captioning research. More info on our DTV captioning project is available at http://ncam.wgbh.org/dtv/ And to echo what other have already said, we'll certainly be able to apply some of the digital captioning research to a timed-text format. >>DVD captioning systems have yet another format, although I am not aware of >>the exact standard that covers this or what the encoding is exactly. I >>know a person closely involved in DVD standards - if someone cares, I >>could inquire. True DVD closed captions (not subtitles) are of the line-21 variety, similar to regular NTSC broadcast captions. They're available on Region 1 discs only. Just for general info, for those who aren't already aware of it: NCAM is currently working on version 2.0 of MAGpie, caption/audio-description software for digital media. It's available for free at http://ncam.wgbh.org/webaccess/magpie/magpie2_beta.html This is beta software; the final version will be available in March. Geoff Freed WGBH/NCAM On Wednesday, January 23, 2002, Michael A. Dolan <miked@tbt.com> wrote: >Philipp thought this note may be of interest to this list. > >>Date: Wed, 23 Jan 2002 07:12:25 -0800 >>To: Philipp Hoschka <ph@w3.org> >>From: "Michael A. Dolan" <miked@tbt.com> >>Subject: Re: [Fwd: Timed Text work] >> >>Philipp- >> >>Both Europe and the US have had captioning and teletext standards for >>television for quite some time. These are old, binary encodings (and >>obviously not XML-based). The US standards are EIA-608 and EIA-708. The >>European standards are in ITU documents I believe, but don't recall them >>off the top of my head (could find them if someone cares). >> >>DVD captioning systems have yet another format, although I am not aware of >>the exact standard that covers this or what the encoding is exactly. I >>know a person closely involved in DVD standards - if someone cares, I >>could inquire. >> >>SMPTE DDE-1 can be used for this purpose with its triggers >>(application/tve-trigger), but is a bit heavy weight for just "timed >>text". There were some advanced captioning prototypes developed by WGBH >>(public television in Boston) that used DDE-1 to do some really >>interesting captioning applications. >> >>There are proprietary XML-based solutions in use today by the commercial >>producers of captioning. As far as I know, they have not published their >>work, but may do so if encouraged. >> >>And, the emerging Digital Cinema market is off defining something new and >>re-inventing captioning for that market. I have not kept up with their >>work, but understand it is proceeding in parallel. I can inquire here as well. >> >>IETF AVT-WG has had some activity on this topic. There was an ID >>(draft-westerlund-avt-rtp-static-media-00.txt), but you should contact the >>AVT chair for where this activity stands. >> >>So, the answer is yes, many times now, and it would sure be a shame to >>create yet another effort. All these overlap in varying degrees, but the >>closest direct hit is the XML-based proprietary systems in use by the >>commercial captioning companies (WGBH Caption Center and SDI Media are two). >> >>SMPTE D27 would be very interested in this work, so I would like to remain >>informed in detail of W3C's activity in this area. Where is this WG >>organized relative to the reports made in the HTML-CG? >> >>Regards, >> >> Mike >
Received on Wednesday, 23 January 2002 17:17:07 UTC