[WR/ARIB] (meta) Compatibility with ARIB-TTML

[himorin]

Per: w3c/ttwg#116
Comment 3 (summary part)

Five sub issues will be raised following this.

ARIB-TTML is defined as an extension of SMPTE-TT in Vol. 1, Part 3 of ARIB STD-B62. ARIB-TTML is used in UHDTV and some of streaming services in Japan. In UHDTV receivers, ARIB-TTML document is processed by the pre-installed processor in a receiver. In streaming services, ARIB-TTML documents are processed by applications of Hybridcast that is one of the recognized Integrated Broadcast-Broadband systems by ITU. It allows to handle text and image in the same profile as SMPTE-TT does. ARIB-TTML has the features including additional font handling, animation, audio presentation, and additional style control. While capability of those features are similar to IMSC, conversion is required between ARIB-TTML and IMSC to maintain the equivalent content. For this purpose, major points to be considered for the conversion is provided.

[css-meeting-bot]

The Timed Text Working Group just discussed [WR/ARIB] (meta) Compatibility with ARIB-TTML w3c/imsc#545, and agreed to the following:

• SUMMARY: TTWG raised this for discussion today, and would like to discuss the sub-issues in further detail in future meetings.

The full IRC log of that discussion

<nigel> Topic: [WR/ARIB] (meta) Compatibility with ARIB-TTML #545
<nigel> github: https://github.com//issues/545
<nigel> Nigel: These 5 issues mainly don't need change right now but they do need discussion.
<nigel> .. I don't think we can make any changes to IMSC 1.2 for them but we can consider
<nigel> .. and discuss changes for future versions, if needed.
<nigel> .. It's also worth noting that some of the ARIB-TTML features look like they are coincident
<nigel> .. with either existing IMSC 1.2 features or TTML2 features. That is why further
<nigel> .. discussion with ARIB would be very useful, to understand the best path forward for
<nigel> .. all parties.
<nigel> Pierre: I think the devil is in the detail and we have to study each issue. I agree with Nigel's summary.
<nigel> Nigel: Any other comments?
<nigel> Cyril: To make sure I understand, you say we will defer to the next version but when
<nigel> .. practically will we start talking about them?
<nigel> Pierre: I suggest agenda+ these for the next meeting, to start discussing it.
<nigel> Nigel: That works for me.
<nigel> Cyril: Fine for me also. I would suggest that at least for the PUA/Gaiji discussion we invite
<nigel> .. Vladimir.
<nigel> Pierre: Yes. At least on that one it is an intersection of many things - what is possible
<nigel> .. with fonts, what ARIB thinks and what we think! A complex discussion.
<nigel> SUMMARY: TTWG raised this for discussion today, and would like to discuss the sub-issues in further detail in future meetings.
<nigel> rrsagent, make minutes v2
<RRSAgent> I have made the request to generate https://www.w3.org/2020/05/21-tt-minutes.html nigel