As in TTML a region has always a predefined size, tt:p- and tt:span
elements are the better choices to apply a non-transparent background
color on a subtitle block that dynamically grows and shrinks with the
corresponding text.
Unfortunately padding cannot be applied to tt:p and tt:span elements and
the very common use case to have empty space between text and the border
of a centered "text box" with dynamic width is hard to implement (for an
illustration of two use cases see the attached images).
Therefore the EBU-Working group that specifies the TTML subset EBU-TT
sees the requirements to add padding as an applicable style property for
the tt:p and tt:span elements.
Best regards,
Andreas
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Andreas Tai
Production Systems Television IRT - Institut fuer Rundfunktechnik GmbH
R&D Institute of ARD, ZDF, DRadio, ORF and SRG/SSR
Floriansmuehlstrasse 60, D-80939 Munich, Germany
Phone: +49 89 32399-389 | Fax: +49 89 32399-200
http: www.irt.de | Email: tai@irt.de
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registration court& managing director:
Munich Commercial, RegNo. B 5191
Dr. Klaus Illgner-Fehns
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