RE: [Bug 26923] New: [InbandTracks] Number of HTML tracks from DASH

I recommend identifying ISO/IEC 14496-30 (MPEG-4 Part 30) Subtitle tracks, in addition to audio and video.

" For AdaptationSets for which the MIME Type is supported, it shall expose AdaptationSet whose MIME type is "video/*" (resp. "audio/*" or " application/ttml+xml") as HTML VideoTracks (resp. Audio or subtitle Tracks) and as TextTracks for all others."

Both WebVTT and TTML (optionally, with images) can be delivered as a track in an ISO Media file or as DASH Media Segments containing ISOBMFF movie fragments. 
A WebVTT IANA Media Type should be registered and included in order to recognize compatible WebVTT content and decoding capability.

Kilroy Hughes | Senior Digital Media Architect |Windows Azure Media Services | Microsoft Corporation 


-----Original Message-----
From: bugzilla@jessica.w3.org [mailto:bugzilla@jessica.w3.org] 
Sent: Monday, September 29, 2014 2:02 AM
To: public-html-admin@w3.org
Subject: [Bug 26923] New: [InbandTracks] Number of HTML tracks from DASH

https://www.w3.org/Bugs/Public/show_bug.cgi?id=26923


            Bug ID: 26923
           Summary: [InbandTracks] Number of HTML tracks from DASH
           Product: HTML WG
           Version: unspecified
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Sourcing In-band Media Resource Tracks
          Assignee: silviapfeiffer1@gmail.com
          Reporter: cyril.concolato@telecom-paristech.fr
        QA Contact: public-html-bugzilla@w3.org
                CC: mike@w3.org, public-html-admin@w3.org

"A user agent recognises and supports data from a MPEG DASH media resource as being equivalent to a HTML track based on the AdaptationSet or ContentComponent mimeType:"
It is unclear how many tracks should be created: 1 per AS or 1 per Representation, or 1 per ContentComponent. Also, it is not clear which AS should be exposed ? All including those for which the mime type is not supported? 

Please rephrase using normative statements such as:
"User agents shall expose HTML tracks for all AdaptationSet elements in an MPD.
For  AdaptationSets for which the MIME type is not supported, it shall expose the associated tracks as HTML TextTracks. For AdaptationSets for which the MIME Type is supported, it shall expose AdaptationSet whose MIME main type is "video" (resp. "audio") as HTML VideoTracks (resp. AudioTracks) and as TextTracks for all others. In a given AdaptationSet, UA shall expose all Representations as an HTML Track. If representations carry multiplexed streams, the UA shall expose each ContentComponent as an HTML Track."

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Received on Monday, 29 September 2014 15:56:31 UTC