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Re: [MSE] F2F discussion items

From: Pierre-Anthony Lemieux <pal@sandflow.com>
Date: Tue, 29 Apr 2014 09:48:15 -0700
Message-ID: <CAF_7JxByAc1TnH1Znez6w1iTOym4SbDixGHCP=xKn=1q2iA3mA@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,

> But on the mpeg list there was exactly the opposite suggestion,
> that there be only one box.

Which MPEG list?

> That’s inappropriate, I think.  And strange.

Uh. Ok. Why?

Best,

-- Pierre

On Tue, Apr 29, 2014 at 9:42 AM, David Singer <singer@apple.com> wrote:
>
> On Apr 28, 2014, at 20:27 , Pierre-Anthony Lemieux <pal@sandflow.com> wrote:
>
>> 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.
>
> OK.  But on the mpeg list there was exactly the opposite suggestion, that there be only one box.
>
>>
>>> 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…
>
> There has to be some agreement what the kinds mean;  we can’t have random communities inventing kinds and then finding they use the same word with different meanings.  I think that the w3c needs to document them, and if you are not in the w3c’s spec/radar, you are on your own.
>
>>
>>> 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.
>
> That’s inappropriate, I think.  And strange.
>
>>
>> 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.
>>>
>>>
>>
>
> David Singer
> Manager, Software Standards, Apple Inc.
>
Received on Tuesday, 29 April 2014 16:49:05 UTC

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