[whatwg] Media elements statistics

Silvia Pfeiffer silviapfeiffer1 at gmail.com
Tue May 17 23:19:26 PDT 2011

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?


More information about the whatwg mailing list