Re: URI for HTML5 Kind values in MP4 files

Hi Cyril,

I think this sounds good because the current set of kind values is very
limited and not generally useful; conversely a fixed limited set does
allow user agents to be written that offer kind-based functionality more
easily.

The only meaningful functionality I am aware of is whether to present the
track or not, which cannot be derived from a schemeURI.

Therefore right now I'm in favour of your proposal, with the addition that
there should be a boolean companion value that tells the UA whether to
present the track by default or not.

Kind regards,

Nigel


On 21/06/2016 16:19, "Cyril Concolato"
<cyril.concolato@telecom-paristech.fr> wrote:

>Hi,
>
>The ISOBMFF introduced the 'kind' box (see ISO/IEC 14496-12:2015,
>available here 
>http://standards.iso.org/ittf/PubliclyAvailableStandards/c068960_ISO_IEC_1

>4496-12_2015.zip).
>This 'kind' box can be used to store the 'kind' of a track as defined by
>different standards. For instance, it could be used to store DASH
>Descriptors associated with a track or the HTML 5 'kind' values for
>audio/video/text tracks. In order to tell from a kind value, which
>standard is referred to, the "kind" box stores a pair: schemeUri / value
>(similar to DASH descriptors).
>
>This email is to propose that the HTML standard defines a schemeUri for
>its kind values. I'm sending this request to this list first, as I think
>this probably should be reviewed in the context of the sourcing spec
>first. I propose to define the following schemeURI "urn:w3c:html5:kind".
>
>I have made a set of mp4 files with the different values available here:
>http://download.tsi.telecom-paristech.fr/gpac/mp4box.js/mp4/html5-kind/.

>I have also made a test player that parses these mp4 files based on
>MP4Box.js and that creates MSE SourceBuffers, setting the Track Defaults
>with the values from the mp4 file. The demo is here:
>http://download.tsi.telecom-paristech.fr/gpac/mp4box.js/. Check the
>"HTML 5 Track Kind" examples. Unfortunately, it is not fully working in
>browsers as no current browser supports the Track Defaults feature, yet.
>I hear also that the feature itself is marked at risk in MSE, which
>would be a problem I think.
>
>Comments, questions are welcome.
>
>Regards,
>
>-- 
>Cyril Concolato
>Multimedia Group / Telecom ParisTech
>http://concolato.wp.mines-telecom.fr/

>@cconcolato
>
>

Received on Monday, 27 June 2016 15:34:34 UTC