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RE: RE: Re: Re: TTML and aspect ratio

From: John Birch <John.Birch@screensystems.tv>
Date: Fri, 1 Feb 2013 10:07:06 +0000
To: David Ronca <dronca@netflix.com>, "public-tt@w3.org" <public-tt@w3.org>
Message-ID: <0981DC6F684DE44FBE8E2602C456E8ABAAF030A9@SS-IP-EXMB-01.screensystems.tv>
RE Davids point below and Sean's comment:

"I believe that this scenario does add weight to the case for having tools to position drawing regions where the registration point is other than the top left; and this is open issue 21 http://www.w3.org/AudioVideo/TT/tracker/issues/21."

I disagree with the above... (unless by regions you mean the root container!).

I believe this adds weight to a case for having a mechanism to define the registration point of the root container with respect to any assumed underlying presentation. I.e. a means to specify where the root container origin is located.
Also desirable may be a mechanism to describe how co-ordinates within the root container are scaled against the external context. (e.g. 1:1, scaled to maintain AR, scaled to fit [current behaviour])


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P Before printing, think about the environment-----Original Message-----
From: David Ronca [mailto:dronca@netflix.com]
Sent: 01 February 2013 01:56
To: public-tt@w3.org
Subject: RE: Re: Re: TTML and aspect ratio

Sean Hayes wrote: > What we do stipulate is that whatever mechanism is used, the caption root container should be 100% aligned to the presented video.

This still presents a difficulty.  We have received many 608 captions for content that is 16:9.  In this use case, the root container needs to be a 4:3 area that is the full height of the video window and width is 4/3 height, horizontally centered.

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Received on Friday, 1 February 2013 10:07:35 UTC

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