W3C home > Mailing lists > Public > public-media-fragment@w3.org > May 2011

Re: Temporal media fragment for HTML media questions

From: Philip Jägenstedt <philipj@opera.com>
Date: Tue, 10 May 2011 11:06:57 +0200
To: public-media-fragment@w3.org
Message-ID: <op.vu9cxvaisr6mfa@localhost.localdomain>
On Tue, 10 May 2011 10:54:38 +0200, Silvia Pfeiffer  
<silviapfeiffer1@gmail.com> wrote:

> On Tue, May 10, 2011 at 6:39 PM, Chris Double <cdouble@mozilla.com>  
> wrote:
>> On Tue, May 10, 2011 at 8:08 PM, Philip Jägenstedt <philipj@opera.com>  
>> wrote:
>>>> 1) When a temporal fragment is given with a start time, when the
>>>> loadedmetadata event on the resource is raised this is the currentTime
>>>> of the resource.
>>> Do you mean that you internally seek when reaching HAVE_METADATA?  
>>> That's
>>> what I did, but care must be taken to not show the first frame of the  
>>> video
>>> before seeking. Also, should seeking events be fired at this point?
>> I internally seek after I've read the metadata from the resource, then
>> raise HAVE_METADATA when the seek is complete. I don't fire the
>> seeking events. Would it be better to do HAVE_METADATA, then seek and
>> raise the usual seeking events?
>>>> 2) When an end time is given I do the equivalent of calling 'pause()'
>>>> on the media element. I do not raise the 'ended' event.
>>> Is paused set to true, or is the element "paused for user  
>>> interaction"? I
>>> think the latter actually makes sense, but when I implemented MF as a  
>>> quick
>>> hack for FOMS I just called pause().
>> It behaves exactly as if the 'pause()' method was called on the media
>> element, so 'paused' is set to true. I think this makes it easier for
>> controls to stay in sync with what's happening.
> I wonder if it would be better to behave like "cropping" during the
> load and as long as no user interactions happen. Thus, fire
> metadataloaded when the offset time is reached and fire ended when the
> end time is reached. Do you think that would cause problems?

By cropping I meant that the timeline is modified to map 0 to the start of  
the fragment and the duration is the duration of the fragment. This would  
make it impossible to seek outside the fragment, the user wouldn't even  
know that there was something called a fragment. Thus, it doesn't make  
sense to switching between cropping and something else.

Philip Jägenstedt
Core Developer
Opera Software
Received on Tuesday, 10 May 2011 09:07:27 UTC

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