Re: [blink-dev] WebVTT vs TTML Features

I think it has clearly to be stated that this is a view (!) on the 
"complicated world" and this view is expressed in technical strategies 
and decisions. It does not reflect the current use of captioning formats 
on the web. (The fact that captioning on the web is more than native 
caption support by web browsers has been explored in earlier threads, so 
no need to go into detail here).

When the WHATWG discussed in 2009 a captioning format for the 
integration of HTML5, TTML was a candidate. At least part of the group 
were well aware that TTML was specified as a rendering (or presentation) 
format (in addition (!) to the use for authoring, exchange and archiving).

The decision to build upon SRT instead of  TTML and the reasons that led 
to this decision have to be respected. But it seems not correct to me 
now to deny that TTML is a rendering format for "web distribution of 
captions" and ignore the fact that it is widely used for this purpose. 
It was used before WebVTT reached a stable status. This fact seems not 
to be well known and it is often mistrusted so indeed a list which 
content providers already use TTML would make this more transparent.

It seems like an irony of the story that the format that were added at a 
later stage for the same purpose makes a claim to be the only legitimate 
candidate for that purpose.

We have two W3C rendering formats for captions on the web. This is not a 
pleasant situation. But we have to cope with it. The new development to 
combine both efforts in one group is a good, pragmatic start. It can 
work out if on both sides co-existence on the same field is accepted.

Best regards,

Andreas

Am 11.12.2013 00:49, schrieb Silvia Pfeiffer:

> Correct. TTML is for authoring, VTT for rendering.

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Received on Thursday, 12 December 2013 06:55:26 UTC