- From: Pierre-Anthony Lemieux <pal@sandflow.com>
- Date: Tue, 29 Apr 2014 09:48:15 -0700
- 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