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Re: Action-28: updated syntax document with time formats

From: RaphaŽl Troncy <Raphael.Troncy@cwi.nl>
Date: Thu, 05 Feb 2009 01:08:40 +0100
Message-ID: <498A2E08.7080200@cwi.nl>
To: Conrad Parker <conrad@metadecks.org>
CC: Jack Jansen <Jack.Jansen@cwi.nl>, Media Fragment <public-media-fragment@w3.org>

Dear Conrad,

> We've seen users often want to write eg. "2:30" to specify a time of 2
> minutes 30 seconds, rather than having to type out 0:02:30. I'd
> suggest making the hours specification optional.

Hum, currently the syntax allows to use either a npt value (in your case 
150s for 2:30) or a smpte value (for which the hour is not optional). 
Which scheme would you like to add that would have the hour optional? 
Could you give it a name?

> Using a single ':' to separate an optional frame count from the rest
> of the time is visually ambiguous -- eg. does 1:12:07 refer to 1m12s7f
> or 1h12m7s? We can't expect users to consult the grammar to see that
> hours are mandatory and frames are optional.

In smpte, it is not ambiguous :-) But you're right, you need to know the 
grammar ...

> I suggest using two colons '::' as the frame separator, which I recall
> having seen commonly used in video applications.

We could do that, but with a 3rd scheme that would not be npt or smpte. 
What would you suggest?
Could you please suggest (simpler) valid media fragment URI?
Cheers.

   RaphaŽl

-- 
RaphaŽl Troncy
CWI (Centre for Mathematics and Computer Science),
Science Park 123, 1098 XG Amsterdam, The Netherlands
e-mail: raphael.troncy@cwi.nl & raphael.troncy@gmail.com
Tel: +31 (0)20 - 592 4093
Fax: +31 (0)20 - 592 4312
Web: http://www.cwi.nl/~troncy/
Received on Thursday, 5 February 2009 00:09:34 GMT

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