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RE: ISSUE-346: Need ttp:mediaDuration parameter [TTML2]

From: John Birch <John.Birch@screensystems.tv>
Date: Thu, 25 Sep 2014 09:38:45 +0000
To: Timed Text Working Group <public-tt@w3.org>
Message-ID: <0981DC6F684DE44FBE8E2602C456E8AB016C0DB082@SS-IP-EXMB-01.screensystems.tv>
I am uncertain about the 'requirement' for a duration parameter?
What is the current situation... does TTML1 work as if the media duration is 'indefinite' ?
In which case what additional benefit does having a defined duration bring?

Of far more importance (IMHO) is a media start value - that allows time values within a document to be 'offset' relative to the start of associated media.

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P Before printing, think about the environment-----Original Message-----
From: Timed Text Working Group Issue Tracker [mailto:sysbot+tracker@w3.org]
Sent: 21 September 2014 13:35
To: public-tt@w3.org
Subject: ISSUE-346: Need ttp:mediaDuration parameter [TTML2]

ISSUE-346: Need ttp:mediaDuration parameter [TTML2]


Raised by: Glenn Adams
On product: TTML2

In order to perform ISD processing, it is necessary to know the duration of root external extent. When associate with a related media object, this is the simple duration of the related media object. If this is known at authoring time, then it is an important parameter that should be specified. I propose defining a ttp:mediaDuration parameter attribute that takes either an offset-time form of a time expression or the keyword "indefinite", where the latter is used (or implied) when no related media object exists or its simple duration is unknown or indefinite. If this parameter is not specified, then it would be treated as if indefinite were specified.

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Received on Thursday, 25 September 2014 09:39:17 UTC

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