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Re: Should we consider the user?

From: RaphaŽl Troncy <Raphael.Troncy@cwi.nl>
Date: Fri, 03 Apr 2009 20:15:40 +0200
Message-ID: <49D6524C.3080703@cwi.nl>
To: Jack Jansen <Jack.Jansen@cwi.nl>
CC: Media Fragment <public-media-fragment@w3.org>
Dear Jack,

> Agreed. We could add some non-normative text that implementations are 
> expected to do something like find a random-access-point or I-frame or 
> whatever the underlying format supports. We could also state that if the 
> underlying format allows logical in- and out-points (like Ogg seems to 
> do) these should be used to refine the interval.

I would second Silvia's suggestion: create a new wiki page about 
implementation hints that gather all these thoughts.
An informal action for you?

> Let me give an example. I download 
> <http://www.example.com/example.mp4#t=100,200> to a local file 
> "myclip.mp4". Next, I mail off myclip.mp4 to you. You open it in a video 
> editor. Assuming this video editor will show timestamps as they appear 
> in the original media (as opposed to starting at "0" for every file), 
> there are 3 possibilities:
> a. We standardise that you will always see 100 as the timestamp of the 
> first frame (or a number slightly lower, because of (1) above).
> b. We standardise that you will always see 0.
> c. We specifically state that this is up to the implementation.

Hum, I have to admit that my first original reaction would be: "as soon 
as the client has downloaded the fragment bits and saved them in a new 
file 'myclip.mp4', he has created a *new* resource". Consequently, your 
solution b) that you have just added for the sake of completeness would 
be my favorite :-(
Having said that, and after giving a second thought, I think c) is also 
a good answer, which is also Silvia's favorite. Definitively not a) that 
makes no sense for me.
The rest of the WG, more thoughts?
Best regards.

   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 Friday, 3 April 2009 22:38:03 GMT

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