[WR/ARIB] Compatibility with ARIB-TTML / 3. Animation

[himorin]

Per: https://github.com/w3c/ttwg/issues/116 Comment 3 (https://github.com/w3c/imsc/issues/545), 3

Simple animation can be embedded in an ARIB-TTML document with “arib-tt:keyframes” and “arib-tt:animation” elelments. The “arib-tt:keyframes” element specifies an object to be animated and its appearance such as a set of images, color, and size. The “arib-tt:animation” element specifies how the object specified by the “arib-tt:keyframes” element is animated such as duration, number of iteration, and transition effect.

[nigelmegitt]

Animation of this sort requires support for the TTML2 feature #animation-version-2. This is not yet included in IMSC.

One action to consider is adding this to the requirements for a future version of IMSC, especially if there is implementer interest.

[css-meeting-bot]

The Timed Text Working Group just discussed [WR/ARIB] Compatibility with ARIB-TTML / 3. Animation imsc#548, and agreed to the following:

• SUMMARY: TTWG is interested to know more about the usage of these features, and complexity of implementation.

The full IRC log of that discussion

<nigel> Topic: [WR/ARIB] Compatibility with ARIB-TTML / 3. Animation imsc#548
<nigel> github: https://github.com/w3c/imsc/issues/548
<nigel> Cyril: Nigel noted it matches #animation-version-2.
<nigel> .. I think our answer is similar to #546 that we would like to have use cases and examples.
<nigel> Nigel: And I assume complexity is an issue here too.
<nigel> Cyril: Yes
<nigel> Nigel: Looking at it from a spec development perspective it would be easy to add, but
<nigel> .. a lot of work for implementers.
<nigel> Pierre: That's an understatement. We need to know more details about what support is
<nigel> .. needed, especially from an interop perspetive.
<nigel> s/etiv/ective
<nigel> SUMMARY: TTWG is interested to know more about the usage of these features, and complexity of implementation.