[whatwg] Media elements statistics

[Silvia Pfeiffer]

On Fri, May 6, 2011 at 3:04 AM, Steve Lacey <sjl at chromium.org> wrote:
>
>
> On Thu, May 5, 2011 at 2:54 AM, Jeroen Wijering <jeroen at longtailvideo.com>
> wrote:
>>
>> Hey Steve,
>>
>> This looks great; would be a really useful set of data for video players /
>> publishers. Since none of the metrics have a time component, developers can
>> sample the data over the window / at the frequency they prefer.
>>
>> Would jitter be calculated over decodedFrames or
>> decodedFrames+droppedFrames? In the first case, jitter is a more granular
>> metric for measuring exact presentation performance. In the latter case,
>> jitter can serve as a single metric for tracking processing power (simple!).
>> In either case, it's fairly straightforward to calculate towards the other
>> metric.
>
> Actually, I would expect presentedFrames + droppedFrames would be used. This
> implies all decoded frames that were supposed to be presented.


Do we also expose to the JS developer how many frames we actually
requested, so we can calculate rates?

Silvia.