Re: WebVTT, Regions and live streams.

> On Sep 29, 2015, at 21:53 , Silvia Pfeiffer <silviapfeiffer1@gmail.com> wrote:
> 
>> case 2 (cues that overlap segmentation)
>> As for the segmentation, assume we have the following: Assuming a region with 2 lines, and let’s say we want to push out each word every 3/4 second (by using the timing mechanisms).  (I’ve left out any cue settings to make it a bit clearer)
>> 
>> 00:00:00.000 —-> 00:00:17.500
>> Caption <00:00:00.750>Line <00:00:01.500>1
>> 
>> 00:00:03.000 —> 00:00:22.000
>> Caption <00:00:03.750>Line <00:00:04.5>2<00:00:5.25>Longer<00:00:6.000>extended
>> 
>> If we need to provide segmentation at 5 second intervals, the segmentation process does not have the words “Longer” and “Extended”; they haven’t been entered by the captioner.
> 
> 
> Why do you need to provide segmentation at 5 second intervals?
> 
> 
>> It also doesn’t know what the end time should be, as it should be 16 seconds from the end of the last word.
> 
> You can choose the end time to be whatever suits best. Is your cue now
> supposed to be a max of 5 seconds long or 16 seconds long?
> 
> 
>> Creating a new cue that starts for “Longer” and “extended” will cause the “Caption Line 2” part to scroll; we want it to continue on the same line.
> 
> 
> That's not the problem of the cue, but the problem that you want to
> segment at 5 second intervals.
> 
> 
>> I’d like to know if there is a clear solution to these problems, and if not, if additions to the specification can be added to handle these cases.
> 
> It should all work with the adjustment of the end time as needed,
> unless I am missing something.
> 

for segmentation, you might want to use the MP4 wrapper — we defined how to store cues in MP4 so that segmentation would be possible. (Though I think you know that).


David Singer
Manager, Software Standards, Apple Inc.

Received on Wednesday, 30 September 2015 17:03:21 UTC