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TTML2 comments on roll-up and paint-on captions

From: Goldstein, Glenn <glenn.goldstein@viacom.com>
Date: Wed, 12 Jul 2017 22:17:59 +0000
To: "public-tt@w3.org" <public-tt@w3.org>
Message-ID: <16FE2655-FE1C-482B-AF38-BDE83CA6264D@viacom.com>
In my opinion, the approach taken for supporting roll-up and paint-on modes (2 important caption styles in the US) could be simplified by having explicit regions attributes, as in tts:paintmode=”rollup” or tts:paintmode=”painton”. For rollups, the scrolling style could also be designated as “smooth” or “discrete”.

This approach would simplify the conversion of 608/708 captions to TTML, and eliminate the complexity and clutter of overlapping cues and timed <span> tags.


Glenn Goldstein
SVP, Chief Technology Convergence Officer
Viacom MTS


Received on Wednesday, 12 July 2017 22:18:29 UTC

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