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Re: Draft TTML Codecs Registry

From: Cyril Concolato <cyril.concolato@telecom-paristech.fr>
Date: Thu, 15 May 2014 10:59:40 +0200
Message-ID: <537481FC.7060403@telecom-paristech.fr>
To: public-tt@w3.org
Hi Glenn,

Le 15/05/2014 09:55, Glenn Adams a écrit :
> See [1].
>
> [1] https://www.w3.org/wiki/TTML/CodecsRegistry
It's a good start but please don't talk about RFC6381 (except maybe for 
the choice of characters) and "stpp.ttml", MPEG will specify that. The 
TTML WG should just focus on a parameter definition for the 
application/ttml+xml MIME type. The way I see it you would have:

Content-Type: application/ttml+xml; profiles="A+B|C+D|E" (or whatever 
syntax or parameter name is chosen in the end)

Which MPEG will take to say, when the TTML document is stored in a track 
in an MP4 file, the codecs value for that track will be:

codecs="stpp.ttml.A+B|C+D|E"
and the MIME type for that MP4 file will be:

Content-Type: video/mp4; codecs="stpp.ttml.A+B|C+D|E"

Does that make sense?

Cyril


-- 
Cyril Concolato
Multimedia Group / Telecom ParisTech
http://concolato.wp.mines-telecom.fr/
@cconcolato
Received on Thursday, 15 May 2014 09:00:07 UTC

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