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Re: [MSE] F2F discussion items

From: Pierre-Anthony Lemieux <pal@sandflow.com>
Date: Mon, 28 Apr 2014 20:27:43 -0700
Message-ID: <CAF_7JxD8+8G__KpN=tSYUhhBVHNDZkp4QmP0W7TYXFzNZsf__g@mail.gmail.com>
To: David Singer <singer@apple.com>
Cc: Paul Cotton <Paul.Cotton@microsoft.com>, "public-html-media@w3.org" <public-html-media@w3.org>
Hi David,

Some data points/questions below.

> Quantity:          Zero or more

Does this mean that more than one "kind" box can be associated with a
single track? A given timed text track can serve multiple purposes,
e.g. both SDH and subtitle, and hence be associated with multiple
kinds.

> contains the track ‘kind’ as defined <<by the W3C spec //
> section X of this spec. // whatever .>>.

Also, the 'kind' defined in HTML might not be sufficient alone to
cover common kinds of timed text out there, e.g. 'commentary',
'large'/'Text for the Visually Impaired', 'easyreader', 'karaoke',
etc...

> Container:        User data box (‘udta’)

At least one specification (Ultraviolet) use the 'name' field of the
'hdlr' box to carry a comma-separated list of kinds for the timed text
track.

Thanks,

-- Pierre

On Wed, Apr 9, 2014 at 7:15 AM, David Singer <singer@apple.com> wrote:
>
> On Apr 9, 2014, at 15:25 , Paul Cotton <Paul.Cotton@microsoft.com> wrote:
>
>> [MSE] Summary of "Resolving Bug 24370" thread and proposed next steps, Aaron
>> http://lists.w3.org/Archives/Public/public-html-media/2014Apr/0043.html
>>
>
>
> I am checking with the MP4 experts at MPEG, but my inclination is that the box definition belongs in the W3C spec. anyway and would be registered at the MP4RA.  Something like
>
> 1.1.1.1       Definition
>
> Box Type:        ‘kind’
> Container:        User data box (‘udta’)
> Mandatory:      No
> Quantity:          Zero or more
>
> The kind box contains the track ‘kind’ as defined <<by the W3C spec // section X of this spec. // whatever .>>.
>
> 1.1.1.2       Syntax
>
> aligned(8) class TrackKindBox
>    extends FullBox(‘kind’, version = 0, 0) {
>    string   thekind;
> }
>
> 1.1.1.3       Semantics
>
> thekind is a null-terminated string in UTF-8 characters, giving a track kind as defined by <<section X of Y>>.
>
>
>
>
>
>
> David Singer
> Manager, Software Standards, Apple Inc.
>
>
Received on Tuesday, 29 April 2014 03:28:33 UTC

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