- From: Philip Jägenstedt <philipj@opera.com>
- Date: Mon, 19 May 2014 11:22:11 +0200
- To: Silvia Pfeiffer <silviapfeiffer1@gmail.com>
- Cc: "Jerry Smith (WINDOWS)" <jdsmith@microsoft.com>, Bob Lund <B.Lund@cablelabs.com>, Paul Cotton <Paul.Cotton@microsoft.com>, "public-html-admin@w3.org" <public-html-admin@w3.org>
On Mon, May 19, 2014 at 2:46 AM, Silvia Pfeiffer <silviapfeiffer1@gmail.com> wrote: > > On Fri, May 16, 2014 at 8:30 AM, Jerry Smith (WINDOWS) > <jdsmith@microsoft.com> wrote: > > The Introduction section of the In-Band Media Resource document implies that subtitles could be a subset of captions and share a single in-band track. Is there any known example that actually does this? > > > > Jerry > > I've been told that there are some ISO BMFF files that have both 'SDH' > and 'Subtitle' kinds associated with a single timed text track, so > yes. I think the bit that Jerry referred to is "it is possible that a media container may encapsulate a subtitle and a caption track in a single in-band track to save space. In HTML, these tracks will be exposed as two TextTrack objects." If such a track in ISO BMFF is to be exposed as two tracks, is there a way to distinguish which cues should be excluded from the subtitles track? Having two identical tracks is obviously not useful. How do existing media players handle such files? Finally, does ISO BMFF have SDH (subtitles for the deaf or hard-of-hearing) as a separate flag from the subtitle and captions kinds, or is possible to assign an arbitrary number of kinds to a track? Either way it doesn't sound like it maps 1:1 to the HTML track kinds. Philip
Received on Monday, 19 May 2014 09:22:38 UTC