ISSUE-194: root container needs better definition

root container needs better definition

State:
CLOSED
Product:
TTML Simple Delivery Profile for Closed Captions (US)
Raised by:
Mike Dolan
Opened on:
2012-10-25
Description:
TTML defers the definition of the root container to the application. SDP-US is silent. For US captions, the root container must be registered with the related video. By remainig silent, then for example, one implementation could set the origin in the center of the video, or off-screen; or set the extent wildly off-screen. That would not have the a presentation result that meets the intent of this profile. So, we need to define the root contaner in terms of the related coded video (not the physical display which would be unknown to the author). A potential resolution would be to add something of the form: "The root container origin shall be the upper left corner of the related video coding; and the extent shall be the lower right corner."
Related Actions Items:
Related emails:
  1. RE: TTML Agenda for 28/11/12 (from mdolan@newtbt.com on 2012-11-29)
  2. TTML Agenda for 28/11/12 (from Sean.Hayes@microsoft.com on 2012-11-29)
  3. TTWG Meeting Minutes Nov 15, 2012 (from momartin@microsoft.com on 2012-11-15)
  4. RE: TTML Agenda for 15/11/12 (from mdolan@newtbt.com on 2012-11-15)
  5. TTML Agenda for 15/11/12 (from Sean.Hayes@microsoft.com on 2012-11-15)
  6. Suggested Text for Action-126 to Implement Issue-195 (from momartin@microsoft.com on 2012-11-07)
  7. RE: TTWG Meeting Minutes Nov 1: http://www.w3.org/2012/11/01-tt-minutes.html (from momartin@microsoft.com on 2012-11-05)
  8. TTML Agenda for 1/11/12 (from Sean.Hayes@microsoft.com on 2012-11-01)
  9. RE: ISSUE-194: root container needs better definition [Simple Delivery Profile for Closed Captions] (from momartin@microsoft.com on 2012-10-31)
  10. RE: ISSUE-194: root container needs better definition [Simple Delivery Profile for Closed Captions] (from mdolan@newtbt.com on 2012-10-31)
  11. RE: ISSUE-194: root container needs better definition [Simple Delivery Profile for Closed Captions] (from momartin@microsoft.com on 2012-10-31)
  12. ISSUE-194: root container needs better definition [Simple Delivery Profile for Closed Captions] (from sysbot+tracker@w3.org on 2012-10-25)

Related notes:

TTWG Nov 1: http://lists.w3.org/Archives/Public/public-tt/2012Nov/0008.html (updated minutes)

Resolved to add requirement as stated in original issue and add a note that the safe area is handled in authoring content.

Requirement: "The root container origin shall be the upper left corner of the related video coding; and the extent shall be the lower right corner."
Note text: Authors are assumed to account for the safe area in positioning when authoring content.

Monica Martin, 5 Nov 2012, 23:29:54

Implement proposal (mutatis mutandis) at http://dvcs.w3.org/hg/ttml/rev/60e66d5e61e3.

Glenn Adams, 12 Nov 2012, 20:30:56

TTWG Nov 15: http://www.w3.org/2012/11/15-tt-minutes.html

Resolved to accept R0021 and R0022 implemented by editor. Add Note that indicates the related media object is the video in SDP-US.

R0020, R0021, and R0022 describe the appropriate behaviors relative to the root container.

Monica Martin, 16 Nov 2012, 02:27:43

Note text agreed Nov 15: In this case, the related media object is the original video.

Monica Martin, 16 Nov 2012, 02:28:54

Done

https://dvcs.w3.org/hg/ttml/rev/e97977dfca4f

Glenn Adams, 29 Nov 2012, 07:07:34

TTWG Nov 29 approved editor updates: http://www.w3.org/2012/11/29-tt-minutes.html

Monica Martin, 2 Dec 2012, 23:11:18

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