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Re: Proposed extension to HTML5.1 for rollup captions

From: Silvia Pfeiffer <silviapfeiffer1@gmail.com>
Date: Wed, 6 Mar 2013 09:55:23 +1100
Message-ID: <CAHp8n2n78qKCHSJH+=gfnkrHoJbKpydkT69wW6=yvCWT=G-uhw@mail.gmail.com>
To: Paul Cotton <Paul.Cotton@microsoft.com>
Cc: public-html <public-html@w3.org>, david Singer <singer@apple.com>
Hi Paul,

Sorry about the lack of a reply. The CG is currently working on a
transition of editor and preparation for a Final Spec Agreement. It hasn't
happened yet. So, indeed we can wait in the HTML WG until that has happened.

I've cc-ed David Singer who is the chair of the CG in case you need more
information.

Cheers,
Silvia.


On Wed, Mar 6, 2013 at 4:10 AM, Paul Cotton <Paul.Cotton@microsoft.com>wrote:

>  I have not seen a response to my questions:****
>
> ** **
>
> > Has the TextTracks Community Group published a  Final Specification and
> has the W3C issued a call for participants to sign the Final
> Specification Agreement<http://www.w3.org/community/about/agreements/final>[1] for that Final Specification?  Shouldn’t this be done before the
> material is adopted into the HTML WG?****
>
> ** **
>
> If Silvia cannot answer who should I contact?****
>
> ** **
>
> /paulc****
>
> HTML WG co-chair****
>
> ** **
>
> Paul Cotton, Microsoft Canada****
>
> 17 Eleanor Drive, Ottawa, Ontario K2E 6A3****
>
> Tel: (425) 705-9596 Fax: (425) 936-7329****
>
> ** **
>
> *From:* Paul Cotton
> *Sent:* Wednesday, February 20, 2013 3:28 PM
> *To:* 'Silvia Pfeiffer'
> *Cc:* public-html
> *Subject:* RE: Proposed extension to HTML5.1 for rollup captions****
>
> ** **
>
> > One proposals was picked and developed further:
> http://www.w3.org/community/texttracks/wiki/MultiCueBox****
>
> ** **
>
> Has the TextTracks Community Group published a  Final Specification and
> has the W3C issued a call for participants to sign the Final
> Specification Agreement<http://www.w3.org/community/about/agreements/final>[1] for that Final Specification?  Shouldn’t this be done before the
> material is adopted into the HTML WG?****
>
> ** **
>
> /paulc****
>
> HTML WG co-chair****
>
> ** **
>
> [1] http://www.w3.org/community/about/agreements/ ****
>
> ** **
>
> Paul Cotton, Microsoft Canada****
>
> 17 Eleanor Drive, Ottawa, Ontario K2E 6A3****
>
> Tel: (425) 705-9596 Fax: (425) 936-7329****
>
> ** **
>
> *From:* Silvia Pfeiffer [mailto:silviapfeiffer1@gmail.com<silviapfeiffer1@gmail.com>]
>
> *Sent:* Wednesday, February 20, 2013 12:57 AM
> *To:* public-html
> *Subject:* Proposed extension to HTML5.1 for rollup captions****
>
> ** **
>
> Hi all,
>
>
> This is a proposal to extend the TextTrack API in HTML with new objects
> that will enable the display of captions/subtitles as scrolling text, and
> introduce the ability to move a group of caption/subtitle cues from one
> location on the video viewport to another. The feature will allow
> presenting rollup captions from all text track formats that a browser
> supports, including WebVTT and TTML.
>
> Specification:
> https://dvcs.w3.org/hg/text-tracks/raw-file/default/608toVTT/region.html#extension-of-the-html-texttrack-api
> (Only the Appendix is relevant to the HTML WG).
>
> I'm looking for feedback on this feature here. If there are no objections
> and sufficient support for these features, I suggest adding them to the
> HTML5.1 specification.
>
>
> The use case:
> ============
> Summary: Video users of diverse nations are used to the use of rollup
> captions from TV. Deaf users have asked to have all TV content be displayed
> on the Web in the same format. In the US it is a legal requirement to
> support rollup captions on all video devices.
>
> Details:
> The display of captions/subtitles as scrolling text is known as "rollup
> captions" (e.g. [0]). It is one of three standard display styles for
> captions on TV [1]. It is often used when material is live captioned and
> for post-production broadcast programming that only has one speaker. [2]
>
> Rollup is part of the Consumer Electronics Association specifications of
> captioning for analog TV (CEA608) and for digital TV (CEA708). It is not
> only supported on TV but also on DVD through the SCC format [4]. It is used
> in the US, Canada [5], Australia, and probably other countries. The
> QuickTime file format supports it (e.g. [6]).
>
> Rollup captions on all video devices, including devices that display Web
> content, are a legal requirement in the US, introduced through the
> Communications and Video Accessibility Act (CVAA) by the Federal
> Communications Commission (FCC) 79.103 [7].
>
>
> The proposal:
> ===========
> Summary: Introduce a TextTrackRegion object that is a video viewport
> region and can hold multiple TextTrackCues. The properties of
> TextTrackRegion specify the display location and text scrolling mechanism
> for the cues it contains.
>
> Details:
> In the TextTracks Community Group we have analysed how to introduce rollup
> captions using WebVTT and the HTML <track> element.
>
> 11 different proposals were analysed:
> http://www.w3.org/community/texttracks/wiki/RollupCaptions .
>
> One proposals was picked and developed further:
> http://www.w3.org/community/texttracks/wiki/MultiCueBox
> There is a trial implementation in JavaScript for WebVTT:
> https://github.com/silviapfeiffer/WebVTT-with-regions
> Example rendering:
> http://html5videoguide.net/test/WebVTT-with-regions/player.html (needs a
> browser that supports TextTrack, so don't use Firefox).
>
> An experimental implementation in WebKit is forthcoming:
> https://bugs.webkit.org/show_bug.cgi?id=109570
>
> Note: Ian Hickson is not supportive of this feature in WebVTT:
> https://www.w3.org/Bugs/Public/show_bug.cgi?id=20349 and recommends
> browsers to implement SCC [4] support instead. However, the objects
> proposed in this extensions specification would still be required to
> represent the feature.
>
> Are there any objections towards introducing these extensions into HTML5.1?
>
> [0] http://www.slideshare.net/prithviraj_karbar/roll-up-captions-sample
> [1] http://www.dcmp.org/caai/nadh38.pdf
> [2]
> http://abercap.com/blog/2009/03/17/understanding-the-differences-between-roll-up-captioning-pop-on-captioning-and-subtitling/
> [3] http://www.atsc.org/cms/standards/a53/a_53-Part-3-2009.pdf
> [4] http://www.theneitherworld.com/mcpoodle/SCC_TOOLS/DOCS/SCC_FORMAT.HTML
> [5] http://www.cab-acr.ca/english/social/captioning/captioning.pdf
> [6] http://zeitanker.com/common/movies/PedPoster.mov
> [7] http://www.hallikainen.com/FccRules/2012/79/102/index.php
>
> Best Regards,
> Silvia.****
>
>
Received on Tuesday, 5 March 2013 22:56:13 UTC

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