Edit ISSUE-201: How to specify aspect ratio to understand positioning that may apply for display or video.

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Related emails:

  1. April F2F Meeting minutes (from nigel.megitt@bbc.co.uk on 2015-04-22) (from nigel.megitt@bbc.co.uk on 2015-04-22)
  2. TTML Minutes for 15/11/13 (from nigel.megitt@bbc.co.uk on 2013-11-21) (from nigel.megitt@bbc.co.uk on 2013-11-21)
  3. {minutes} TTML Meeting of 24/10/13 (from glenn@skynav.com on 2013-10-24) (from glenn@skynav.com on 2013-10-24)
  4. RE: TTML Agenda for 24/10/13 (from mdolan@newtbt.com on 2013-10-23) (from mdolan@newtbt.com on 2013-10-23)
  5. TTML Agenda for 24/10/13 (from nigel.megitt@bbc.co.uk on 2013-10-23) (from nigel.megitt@bbc.co.uk on 2013-10-23)
  6. RE: TTWG Meeting Minutes March 7, 2013 (from momartin@microsoft.com on 2013-03-07) (from momartin@microsoft.com on 2013-03-07)
  7. TTWG Meeting Minutes March 7, 2013 (from momartin@microsoft.com on 2013-03-07) (from momartin@microsoft.com on 2013-03-07)
  8. [minutes] 2013-02-28 Timed Text (from plh@w3.org on 2013-03-07) (from plh@w3.org on 2013-03-07)
  9. RE: TTWG Meeting Minutes Feb 28, 2013 (from momartin@microsoft.com on 2013-03-07) (from momartin@microsoft.com on 2013-03-07)
  10. TTWG Agenda March 7, 2013 (from momartin@microsoft.com on 2013-03-07) (from momartin@microsoft.com on 2013-03-07)
  11. TTWG Meeting Minutes Feb 28, 2013 (from momartin@microsoft.com on 2013-03-07) (from momartin@microsoft.com on 2013-03-07)
  12. Re: TTML Agenda for 28/2/13 (from glenn@skynav.com on 2013-02-28) (from glenn@skynav.com on 2013-02-28)
  13. RE: TTML Agenda for 28/2/13 (from mdolan@newtbt.com on 2013-02-28) (from mdolan@newtbt.com on 2013-02-28)
  14. TTML Agenda for 28/2/13 (from momartin@microsoft.com on 2013-02-28) (from momartin@microsoft.com on 2013-02-28)
  15. TTWG Meeting Minutes Feb 28 (from momartin@microsoft.com on 2013-02-28) (from momartin@microsoft.com on 2013-02-28)
  16. RE: ISSUE-201: How to specify aspect ratio to understand positioning that may apply for display or video. [TTML.next] (from momartin@microsoft.com on 2013-02-21) (from momartin@microsoft.com on 2013-02-21)
  17. ISSUE-201: How to specify aspect ratio to understand positioning that may apply for display or video. [TTML.next] (from sysbot+tracker@w3.org on 2013-02-21) (from sysbot+tracker@w3.org on 2013-02-21)

Related notes:

See presentation from Netflix provided Feb 14: http://lists.w3.org/Archives/Public/public-tt/2013Feb/att-0041/TTML_AspectRatioProblem.pdf

Monica Martin, 21 Feb 2013, 14:52:33

See threads Jan-Feb 2012, starting here: http://lists.w3.org/Archives/Public/public-tt/2013Jan/0027.html

Monica Martin, 21 Feb 2013, 14:53:33

Proposed text:

If <code>ttp:aspectRatio</code> is "true", the root container SHALL be mapped to a rectangular area within the related video object such that:</p>

- the aspect ratio of the rectangular area is equal to <code>ttp:aspectRatio</code>
- the center of the rectangular area is colocated with the center of the related video object frame,
- the rectangular area is entirely contained within the related video object frame and
- the rectangular area has a height or width equal to that of the related video object frame.

Pierre-Anthony Lemieux, 27 Sep 2013, 21:30:32

Raised by David Ronca

Philippe Le Hégaret, 24 Oct 2013, 15:28:01

Nigel: P1

Philippe Le Hégaret, 24 Oct 2013, 15:28:13

Tweaked proposed text:

If <code>ttp:aspectRatio</code> is present, the root container SHALL be mapped to a rectangular area within the related video object such that:</p>

- the aspect ratio of the rectangular area is equal to <code>ttp:aspectRatio</code>
- the center of the rectangular area is colocated with the center of the related video object frame,
- the rectangular area is entirely contained within the related video object frame and
- the rectangular area has a height or width equal to that of the related video object frame.

Pierre-Anthony Lemieux, 31 Oct 2013, 14:36:32

[nigel]: Glenn to investigate SVG viewbox etc and see if something can be brought in from that space.

15 Nov 2013, 09:23:29

Reassigning from pal to glenn.

Nigel Megitt, 15 Nov 2013, 09:24:04

[nigel]: [TTWG meeting 2015-04-09] Agreed to remove ttp:storageAspectRatio, add a display aspect ratio parameter and deal with overconstrained inconsistent extent in pixels on root, DAR and PAR.

9 Apr 2015, 23:26:13


David Singer <singer@apple.com>, Nigel Megitt <nigel.megitt@bbc.co.uk>, Chairs, Thierry Michel <tmichel@w3.org>, Philippe Le Hégaret <plh@w3.org>, Staff Contacts
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