ISSUE-308: It is unclear how a document is associated with a related video object

Related video object reference missing

It is unclear how a document is associated with a related video object

State:

CLOSED

Product:

TTML IMSC 1.0

Raised by:

Nigel Megitt

Opened on:

2014-05-02

Description:

It is unclear in §4.3 [1] how the relationship between the document and the related video object can be established.

[1] http://www.w3.org/TR/ttml-imsc1/#related-video-object

It would be helpful to state that the Related video object is the TTML1-defined Related media object.

If it is possible that the IMSC document is related to more than one video object, which appears possible, I don't understand how the frame rate constraints are applied. For example a content provider may create different video objects with the same IMSC document, perhaps to offer different size downloads by changing the frame rate (or pixel resolution). However §4.4 Synchronization appears to prevent this, requiring content providers to create a separate version of the IMSC document for each video version.

A solution to this is to use a more generic processing of times for synchronisation purposes.

If the IMSC profile does not support this use case then this needs to be made more explicit e.g. in §4.3.

Related Actions Items:

No related actions

Related emails:

1. {minutes} TTWG Meeting 19/6/2014 (from nigel.megitt@bbc.co.uk on 2014-06-19)
2. RE: {agenda} TTWG Meeting 19/6/2014 (from mdolan@newtbt.com on 2014-06-18)
3. {agenda} TTWG Meeting 19/6/2014 (from nigel.megitt@bbc.co.uk on 2014-06-18)
4. RE: {agenda} TTWG Meeting 12/6/2014 (from mdolan@newtbt.com on 2014-06-12)
5. Re: {agenda} TTWG Meeting 12/6/2014 (from pal@sandflow.com on 2014-06-11)
6. Re: {agenda} TTWG Meeting 12/6/2014 (from nigel.megitt@bbc.co.uk on 2014-06-11)
7. Re: {agenda} TTWG Meeting 12/6/2014 (from pal@sandflow.com on 2014-06-11)
8. Re: {agenda} TTWG Meeting 12/6/2014 (from nigel.megitt@bbc.co.uk on 2014-06-11)
9. {agenda} TTWG Meeting 12/6/2014 (from nigel.megitt@bbc.co.uk on 2014-06-11)
10. RE: {agenda} TTWG Meeting 5/6/2014 (from mdolan@newtbt.com on 2014-06-04)
11. {agenda} TTWG Meeting 5/6/2014 (from nigel.megitt@bbc.co.uk on 2014-06-04)
12. {minutes} TTWG Meeting 15/5/2014 (from nigel.megitt@bbc.co.uk on 2014-05-15)
13. {agenda} TTWG Meeting 15/5/2014 (from nigel.megitt@bbc.co.uk on 2014-05-14)
14. RE: {minutes} TTWG Meeting 8/5/2014 - ISSUE-308 (from John.Birch@screensystems.tv on 2014-05-08)
15. Re: {minutes} TTWG Meeting 8/5/2014 - ISSUE-308 (from nigel.megitt@bbc.co.uk on 2014-05-08)
16. RE: {minutes} TTWG Meeting 8/5/2014 (from John.Birch@screensystems.tv on 2014-05-08)
17. {minutes} TTWG Meeting 8/5/2014 (from nigel.megitt@bbc.co.uk on 2014-05-08)
18. Re: {agenda} TTWG Meeting 8/5/2014 (from tmichel@w3.org on 2014-05-08)
19. {agenda} TTWG Meeting 8/5/2014 (from nigel.megitt@bbc.co.uk on 2014-05-07)
20. ISSUE-308 (Related video object reference missing): It is unclear how a document is associated with a related video object [TTML IMSC 1.0] (from sysbot+tracker@w3.org on 2014-05-02)

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