RE: updated profile registry

Cyril-

Re 'stpp', yes everything you say is correct.  However, because this table
did not exist until now, 'stpp' is in use today.

I suppose we could make it illegal, but I'm not sure that's the right answer
either.

Can we clarify that it is deprecated or something?

Regards,
	Mike

-----Original Message-----
From: Cyril Concolato [mailto:cyril.concolato@telecom-paristech.fr] 
Sent: Thursday, September 24, 2015 9:13 AM
To: public-tt@w3.org
Subject: Re: updated profile registry

Hi Mike,

Le 23/09/2015 21:46, Michael Dolan a écrit :
>
> I’ve updated the profile registry based on comments received.  Note 
> that the URL has changed:
>
> https://www.w3.org/wiki/TTML/ProfileRegistry
>
> FYI, a redirect survives at the “…CodecsRegistry” URL.
>
> I addressed the comments (I think) as agreed except for one – after 
> further thought I decided to delete the example rather than try to 
> further explain 14496-30 informatively.
>
> I thought the combination syntax was in TTML2, but it is not (should 
> be).  So, I left in an informative suggestion for applications using 
> the registry to enable it.
>
> I vaguely recall a 2nd update email on the EBU URN’s but I can’t find 
> it.  If my memory is in fact better than my email filing, then 
> apologies and please send me the changes again.
>
Thank you for the update.

I think having the 'stpp' row is wrong and misleading:
- 2nd column: The "|(any TTML profile used for media type, application/mp4)"
part is very unclear.
-4th column: "||ISO/IEC 14496-12 ISO BMFF|" is not a specification that
"defines the identified processor profile."
- 1st column: 'stpp' is a 4CC defined in the ISOBMFF used to indicate that a
track contains XML Subtitles in general. 'stpp' is not a processor profile
identifier and is not restricted to TTML. If MPEG uses this registry (I
think it will), the codecs parameters for an MP4 file with TTML track will
probably look like:
video/mp4; codecs="stpp.ttml" (when you don't know which profile of ttml is
used), or video/mp4; codecs="stpp.ttml.tt1f" or video/mp4;
codecs="stpp.ttml.im1t"
but not:
video/mp4; codecs="stpp.ttml.stpp" ...


Please delete the 'stpp' row.

Cyril


> Regards,
>
>                 Mike
>
> -------------------------
>
> Michael A DOLAN
>
> TBT, Inc. PO Box 190
>
> Del Mar, CA 92014
>
> (m) +1-858-882-7497
>


--
Cyril Concolato
Multimedia Group / Telecom ParisTech
http://concolato.wp.mines-telecom.fr/
@cconcolato

Received on Thursday, 24 September 2015 17:15:10 UTC