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How to specify aspect ratio to understand positioning that may apply for display or video #30

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plehegar opened this issue Nov 4, 2015 · 11 comments

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@plehegar
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commented Nov 4, 2015

See TTWG Feb 14 Meeting minutes: http://www.w3.org/2013/02/14-tt-minutes.html,text.

How to specify aspect ratio to understand positioning that may apply for display or video.

(raised by Glenn Adams on 2013-02-21)
From tracker issue http://www.w3.org/AudioVideo/TT/tracker/issues/201

Address any outstanding comments under the following, which are hereby incorporated into this issue:

  • #27 interpreting pixel measure
  • #162 need parameter to express storage aspect ratio
@skynavga

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commented May 21, 2016

Change the draft ttp:storageAspectRatio to ttp:displayAspectRatio. Deal with over-constrained parameters in the case that DAR, PAR, and extent are all specified.

@nigelmegitt

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commented May 23, 2016

For information only right now, I'm expecting a related but hopefully orthogonal contribution from an external group on this issue.

@skynavga skynavga changed the title How to specify aspect ratio to understand positioning that may apply for display or video. How to specify aspect ratio to understand positioning that may apply for display or video Sep 13, 2016
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commented Jan 5, 2017

Leave open pending review at upcoming F2F.

@palemieux

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commented Jan 6, 2017

When compositing a document where all lengths are in "%" and which does not specified a PAR, DAR or SAR, against a related video object with DAR=16:9 but a SAR=4:3:

  • the root container PAR is computed to "1" (default)
  • the root container SAR is computed to "4:3" (related video object)
  • the root container DAR is therefore computed to be "4:3"

I would think the default display aspect ratio should be that of the related video object, i.e. the aspect ratio against which the timed text is authored, regardless of the storage aspect ratio that the related video object might use.

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commented Jan 6, 2017

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commented Jan 6, 2017

What is the "resolved resolution of the root container region"?

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commented Jan 6, 2017

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commented Jan 6, 2017

is the resolution of the related media object https://www.w3.org/TR/ttml2/#terms-related-media-object

Stored resolution or displayed resolution?

I think something like tts:fontSize="18px" can only be undefined unless tts:extent is specified (or provided by an external context).

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commented Jan 6, 2017

@skynavga skynavga modified the milestone: TTML2WR Feb 23, 2017
@skynavga skynavga self-assigned this Apr 20, 2017
@skynavga skynavga removed their assignment May 11, 2017
skynavga added a commit that referenced this issue May 21, 2017
skynavga added a commit that referenced this issue May 21, 2017
@skynavga skynavga removed their assignment May 24, 2017
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commented May 24, 2017

Closing with merge from #321.

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