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w3c / ttml-webvtt-mapping

TTML to WebVTT mapping
https://w3c.github.io/ttml-webvtt-mapping/
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Adding background-image support #10

Open plehegar opened 9 years ago

plehegar commented 9 years ago

The note states: "The following CSS properties allowed by WebVTT have no corresponding TTML @style attributes: background-attachment background-image background-position background-repeat [...]"

IMSC1 (and SMPTE-TT) allow the (limited) use of images through the smpte:backgroundImage attribute.

Recommend adding contrained support for background-image to the mapping specification.

(raised by Pierre-Anthony Lemieux on 2015-09-23) From tracker issue http://www.w3.org/AudioVideo/TT/tracker/issues/442

andreastai commented 9 years ago

We try to focus on TTML 1 and its common use. We may add an informative note that background-image could be used for the transport of image based subtitles.

(Andreas Tai, 27 Oct 2015 From tracker issue http://www.w3.org/AudioVideo/TT/tracker/issues/442)