[whatwg] [media] played member expected behavior.

[Philip Jägenstedt]

On Thu, 26 Apr 2012 23:11:37 +0200, Ian Hickson <ian at hixie.ch> wrote:

> On Thu, 26 Apr 2012, Paul Adenot wrote:
>>
>> The played member [1] description of the media element states :
>>
>> > The played attribute must return a new static normalized TimeRanges
>> > object that represents the ranges of the media resource, if any, that
>> > the user agent has so far rendered, at the time the attribute is
>> > evaluated.
>>
>> Currently implementing this member in Gecko, we are wondering the exact
>> meaning of the 'rendered' term. If one seek in a video to a location
>> while being in a paused state, the user agent 'renders' the frame at
>> that location, since it is displayed on the screen. No audio (if any) is
>> rendered, though.
>>
>> In that case, should we create an empty range starting and ending at the
>> time that was seeked to ? That means creating multiple empty ranges if
>> multiple seeks occur while being paused. Does the 'rendering' term
>> implies that playback should occur ? This description need clarification
>> to specify the exact behavior to adopt.
>>
>> Semantically, the name of the member itself ('played') seem to imply
>> playback.
>
> I think playback probably is the most useful. The use case here was
> updating a playback scrub bar with colour for where the user has already
> watched the video, and zero-length entries aren't useful for that.
>
> I've made a note of this e-mail to fix the spec, but in the absence of
> further information or opinions from anyone else, I'd go with playback as
> you suggest.

We haven't implemented this yet, but I agree that must be played, since an  
empty range would violate the definition  
<http://www.whatwg.org/specs/web-apps/current-work/multipage/the-video-element.html#normalized-timeranges-object>.

-- 
Philip Jägenstedt
Core Developer
Opera Software