- From: David Singer <singer@apple.com>
- Date: Fri, 06 May 2011 09:33:52 -0700
- To: Silvia Pfeiffer <silviapfeiffer1@gmail.com>
- Cc: Davy Van Deursen <davy.vandeursen@ugent.be>, Media Fragment <public-media-fragment@w3.org>
On May 5, 2011, at 21:50 , Silvia Pfeiffer wrote: > On Tue, Mar 22, 2011 at 6:25 PM, Davy Van Deursen > <davy.vandeursen@ugent.be> wrote: >> Hi David, >> >> On 21/03/2011 15:55, David Singer wrote: >>> >>> Guys >>> >>> I am not sure that 'named' is really a dimension. >>> >>> I understand focusing on time; focusing on a spatial area; and focusing on >>> tracks. These are indeed orthogonal axes. >>> >>> But you use names to focus on a section, which seems to be a named >>> time-subpart. >>> >>> Specifically, can I use names for subsetting in any of the dimensions? If >>> I have a track called 'fred', are these equivalent? >>> >>> http://www.example.com/thing#track=fred >>> http://www.exampke.com/thing#id=fred >>> >>> Would it not be cleaner to allow selection by name on any of the three >>> axes (i.e. named timed periods, named spacial regions, named tracks)? >> >> To me, 'named' can be seen as a kind of virtual dimension, which points to a >> combination of any of the three "real" dimensions (i.e., time, spatial, or >> track). The mapping between a named fragment and a combination of time, >> spatial, or track is left to the application. >> >> So for example: #id=fred_low could correspond to >> #t=10,20&track=low&xywh=20,20,30,30. It is of course not required to combine >> all dimensions: #t=30,40 could for example correspond to #id=blooper. >> Similarly, #track=fred could correspond to #id=fred if this is defined >> within the application; but as I said, the mapping is out of scope of the MF >> spec. > > I typically use #id to reference chapters, which are a subpart of the > time dimension. > > I'm currently dealing with a demo where I use WebVTT chapters to > navigate a video. It would be really nice if the browser would just > understand video.ogv#chapter2 and I wouldn't have to use script to set > the currentTime to the chapters2 start and catch the ontimeupdate > event to test if I've already gone beyond the end of the chapter2 to > stop playback. > > OTOH, this feature is not urgently needed compared to the temporal and > track dimensions. If I could just convert the label to a time range > through script and then do the media fragment addressing with #t, that > would help a lot, too. > > Silvia. Bring back cue ranges! It would be so easy if one could set up cue ranges that matched the chapters, and then use the enter/exit events to set the labels and so on! David Singer Multimedia and Software Standards, Apple Inc.
Received on Friday, 6 May 2011 16:34:29 UTC