- 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>
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. Best regards, John John Birch | Strategic Partnerships Manager | Screen Main Line : +44 1473 831700 | Ext : 2208 | Direct Dial : +44 1473 834532 Mobile : +44 7919 558380 | Fax : +44 1473 830078 John.Birch@screensystems.tv | www.screensystems.tv | https://twitter.com/screensystems Visit us at SMPTE Annual Technical Conference, Loews Hollywood Hotel, Stand 107, October 21-23 Languages & the Media, Hotel Radission Blu, Berlin, November 5-7 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] http://www.w3.org/AudioVideo/TT/tracker/issues/346 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. This message may contain confidential and/or privileged information. If you are not the intended recipient you must not use, copy, disclose or take any action based on this message or any information herein. If you have received this message in error, please advise the sender immediately by reply e-mail and delete this message. Thank you for your cooperation. Screen Subtitling Systems Ltd. Registered in England No. 2596832. Registered Office: The Old Rectory, Claydon Church Lane, Claydon, Ipswich, Suffolk, IP6 0EQ
Received on Thursday, 25 September 2014 09:39:17 UTC