[whatwg] Start position of media resources

Jonas Sicking jonas at sicking.cc
Thu Apr 9 16:42:18 PDT 2009

On Thu, Apr 9, 2009 at 5:30 AM, Silvia Pfeiffer
<silviapfeiffer1 at gmail.com> wrote:
> On Thu, Apr 9, 2009 at 4:46 AM, Ian Hickson <ian at hixie.ch> wrote:
>> On Wed, 8 Apr 2009, David Singer wrote:
>>> >
>>> > Navigation outside the indicated range could be done in several ways -
>>> > it does not have to be through indicating the full length of the
>>> > resource in the timeline.
>>> surely.  but which one can the URL/page author expect?  If I pick an
>>> innocuous scene out of an R-rated movie and put it on a web page for
>>> children, can they easily see other parts of the movie or not?
>> I think the answer to this should be "yes".
> I agree thus far.
>> For example if someone on
>> reddit links to a particular part of a video, as a user I should trivially
>> (by dragging the scrubber) be able to see the context. I don't think we
>> should be changing the timeline just because the author set a start and
>> end position somehow.
> I understand that this makes sense in a lot of cases - e.g. in
> something like http://www.youtube.com/watch?v=kHXuXWznFgk#t=5s .
> However, I would actually prefer if we make the full resource
> available in a different manner. The reason is that when you link to a
> small segment that is part of a long resource - e.g. 30 seconds out of
> a 5 hour long video - your selection on the timeline is not visible
> and it is unclear where the segment is playing and you're unable to
> scrub around the segment properly.
> Maybe we can introduce a toggle button that allows the timeline to
> show/hide context, in particular for long resources? Or we could
> introduce a attribute that says context="true/false" depending on what
> the page author prefers is being done with the segment? This would
> also allow to hide the context in cases such as the one that David
> described. Not that it can be completely hidden - anyone who
> understands URLs will be able to load the full resource. But it will
> make it more difficult.

If we look at how fragment identifiers work in web pages today, a link such as


this displays the 'target' part of the page, but lets the user scroll
to anywhere in the resource. This feels to me like it maps fairly well


displaying the selected frame, but displaying a timeline for the full
video and allowing the user to directly go to any position.

But I also agree that there is a use case for directing the user to a
specific range of the video, such as your 30 second clip out of 5 hour
video example. Maybe this could be done with syntax like


At this point I agree it makes sense to by default just show a 30
second time line. But with the times showing the start time as 1h and
end time as 1h30s. And probably also UI for the user choosing to
display the full 5 hour timeline. This could even be combined with


but I'm less sure there is a use case for that.

/ Jonas

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