ISSUE-364: Relax constraint between the extents of the root container and the dimensions of the related video object frame

px-extent-constraint

Relax constraint between the extents of the root container and the dimensions of the related video object frame

State:
CLOSED
Product:
TTML IMSC 1.0
Raised by:
Pierre-Anthony Lemieux
Opened on:
2015-01-06
Description:
Per http://lists.w3.org/Archives/Public/public-tt/2014Nov/0087.html

>The implication from CFF-TT of the tts:extent matching other external
>metadata or matching the video size must be explicitly NOT be carried
>into this document, as could be construed as forcing production of
>multiple TTML and images, one for every video size (and it's the lack
>of simple clarity on this point which leads me to suggest simple
>clarification in IMSC).

As currently specified, IMSC1 requires a different Image Profile document to be generated for every resolution version (HD, QHD, etc...) of the related video element. Specifically the renderer is not allowed to scale the root container to match the related video object when 'px' dimensions are used, and 'px' dimensions must be used if images are used.
Related Actions Items:
No related actions
Related emails:
  1. Second CR for IMSC1 (from pal@sandflow.com on 2015-05-04)
  2. Re: List of changes since the IMSC1 CR (from pal@sandflow.com on 2015-04-02)
  3. List of changes since the IMSC1 CR (from pal@sandflow.com on 2015-03-30)
  4. {minutes} TTWG Meeting 2015-03-19 (from nigel.megitt@bbc.co.uk on 2015-03-19)
  5. {agenda} TTWG Meeting 2015-03-19 (from nigel.megitt@bbc.co.uk on 2015-03-18)
  6. Re: {agenda} TTWG Meeting 2015-03-12 (from glenn@skynav.com on 2015-03-11)
  7. {agenda} TTWG Meeting 2015-03-12 (from nigel.megitt@bbc.co.uk on 2015-03-11)
  8. {agenda} TTWG Meeting 2015-03-05 (from nigel.megitt@bbc.co.uk on 2015-03-04)
  9. {minutes} TTWG Meeting 2015-02-26 (from nigel.megitt@bbc.co.uk on 2015-02-26)
  10. {agenda} TTWG Meeting 2015-02-26 (from nigel.megitt@bbc.co.uk on 2015-02-25)
  11. {agenda} TTWG Meeting 2015-02-19 (from nigel.megitt@bbc.co.uk on 2015-02-18)
  12. {agenda} TTWG Meeting 2015-02-12 (from nigel.megitt@bbc.co.uk on 2015-02-11)
  13. {agenda} TTWG Meeting 2015-02-05 (from nigel.megitt@bbc.co.uk on 2015-02-04)
  14. {agenda} TTWG Meeting 2015-01-29 (from nigel.megitt@bbc.co.uk on 2015-01-28)
  15. {minutes} TTWG Meeting 2015-01-22 (from nigel.megitt@bbc.co.uk on 2015-01-22)
  16. {minutes} TTWG Meeting 2015-01-15 (from nigel.megitt@bbc.co.uk on 2015-01-15)
  17. {agenda} TTWG Meeting 2015-01-15 (from nigel.megitt@bbc.co.uk on 2015-01-14)
  18. {minutes} TTWG Meeting 2015-01-08 (from nigel.megitt@bbc.co.uk on 2015-01-08)
  19. {agenda} TTWG Meeting 2015-01-08 (from nigel.megitt@bbc.co.uk on 2015-01-07)
  20. ISSUE-364 (px-extent-constraint): Relax constraint between the extents of the root container and the dimensions of the related video object frame [TTML IMSC 1.0] (from sysbot+tracker@w3.org on 2015-01-06)

Related notes:

PROPOSAL

Remove the following sentence in 6.7.1(2).

"If tts:extent is present on the tt element, the extents of the root container shall be equal to the dimensions of the related video object frame."

This would allow the root container of an Image profile document to be scaled to the related video object frame, just like in the case of Text profile documents.

Pierre-Anthony Lemieux, 6 Jan 2015, 06:14:46

The sentence "ittp:aspectRatio shall not be present if tts:extent is present" would probably also need to be removed.

Pierre-Anthony Lemieux, 8 Jan 2015, 02:18:26

Addressed at https://dvcs.w3.org/hg/ttml/rev/bac9bced3061

Pierre-Anthony Lemieux, 22 Jan 2015, 06:06:59

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