RE: ISSUE-189: do regions scroll their flowed content? [DFXP 1.0]

Between 3s and 4s the <br> in your second <p > is still ‘selected’ into the region.

So 3s – 4s would look like:

3s-4s:
<blank line>
second line
third line

I believe moving the <br> to the end of the previous p elements has the result you intended?

regards,
John

John Birch | Screen Systems | Strategic Partnerships Manager
Main Line : +44 1473 831700 | Ext : 270 | Direct Dial : +44 1473 834532
Mobile : +44 7919 558380 | Fax : +44 1473 830078
John.Birch@screensystems.tv<mailto:John.Birch@screensystems.tv> | www.screensystems.tv<http://www.screensystems.tv> | http://twitter.com/ScreenSubtitles


SMPTE Annual Technical Conference & Exhibition,23-24 October, Stand 112
Loews Hollywood hotel, Hollywood

P Before printing, think about the environment



From: Michael A Dolan [mailto:mdolan@newtbt.com]
Sent: 28 September 2012 16:43
To: 'Timed Text Working Group'
Subject: RE: ISSUE-189: do regions scroll their flowed content? [DFXP 1.0]

Glenn-

We certainly both agree that there is no explicit language about automatic scrolling.  And, the end of line behavior is well documented, I think.

By way of example so we’re clear on the timed flow, the following TTML into a 2-line-height region:

<p begin=”1s” end=”3s”>first line</p>
<p begin=”2s” end=”4s”><br>second line</p>
<p begin=”3s”><br>third line</p>

Would result in the following text over the time periods shown:

1s-2s:
first line
<blank line>

2s-3s:
first line
second line

3s-4s:
second line
third line

4s on:
third line
<blank line>

Right? This would be a very instructive example, I think.

Regards,

                Mike

From: Glenn Adams [mailto:glenn@skynav.com]<mailto:[mailto:glenn@skynav.com]>
Sent: Thursday, September 27, 2012 5:48 PM
To: Michael A Dolan
Cc: Timed Text Working Group
Subject: Re: ISSUE-189: do regions scroll their flowed content? [DFXP 1.0]

Just to clarify, there is no "automatic region scrolling" defined in TTML for overfull conditions. For example:

(1) adding a new line to the end of a full region does not automatically remove the first line (unless that first line is also simultaneously taken out of temporal scope, i.e., timed to end its active duration at the same time the new line begins its active duration);

(2) adding a new character to the end of a full line of a full region does not automatically remove the first line for similar reasons;

Only if explicit timing is provided to remove content simultaneously with adding content can the note referred to below have an affect (provided the processor does what is recommended by the note).

The issue of whether this note is adequate, and if, not what normatively language is sufficient to specify this behavior at some acceptable degree of interoperability is another question.

On Fri, Sep 28, 2012 at 8:34 AM, Michael A Dolan <mdolan@newtbt.com<mailto:mdolan@newtbt.com>> wrote:
The note was carefully crafted not to presume there was any actual region scrolling in the presentation processor. However, if we confirm there is no defined scrolling, then (in addition to explicitly saying that) the new text below probably needs to clarify that “similarity” is not the result of an automatic region scroll, but two synchronic documents resulting from some other event.

At this point, I don’t much care which way it is.  But we can’t leave region scrolling to be presentation processor dependent, which is the state we seem to be in now. That’s just non-interoperable.

Regards,

                Mike

From: Glenn Adams [mailto:glenn@skynav.com<mailto:glenn@skynav.com>]
Sent: Thursday, September 27, 2012 5:06 PM
To: Timed Text Working Group
Subject: Re: ISSUE-189: do regions scroll their flowed content? [DFXP 1.0]


On Thu, Sep 27, 2012 at 11:15 PM, Timed Text Working Group Issue Tracker <sysbot+tracker@w3.org<mailto:sysbot+tracker@w3.org>> wrote:
ISSUE-189: do regions scroll their flowed content? [DFXP 1.0]

There is no explicit, automatic mechanism for scrolling content inside a region; however, a note was added to 2nd Edition at the end of 9.3.2 as follows:

Where an implementation is able to detect significant similarity between two adjacent synchronic document instances, DOCinterN DOCinterN−1, then it is preferred that the implementation make the transition between presenting the two instances as smooth as possible, e.g., as described by [CEA-608-C]<http://dvcs.w3.org/hg/ttml/raw-file/tip/ttml10/spec/ttaf1-dfxp.html#cea608c>, § C.3.



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