[whatwg] Media elements statistics

[Jeroen Wijering]

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.

Resetting the values when @src changes is a good idea. Changing @src is much used for advertising and playlist support (it works around iOS not supporting the play() call).

Kind regards,

Jeroen Wijering



On May 3, 2011, at 12:15 AM, Steve Lacey wrote:

> All,
> 
> I've updated the wiki with a proposal...
> 
> http://wiki.whatwg.org/wiki/Video_Metrics#Proposal
> 
> Cheers!
> Steve
> 
> On Sat, Apr 9, 2011 at 7:08 AM, Silvia Pfeiffer <silviapfeiffer1 at gmail.com> wrote:
> Ah, thanks for the link. I've included Silverlight stats, too, for
> completeness. If somebody knows about QuickTime stats, that would be
> another good one to add, I guess.
> 
> Cheers,
> Silvia.
> 
> On Fri, Apr 8, 2011 at 5:21 PM, Jeroen Wijering
> <jeroen at longtailvideo.com> wrote:
> >
> > On Apr 7, 2011, at 8:11 AM, Silvia Pfeiffer wrote:
> >
> >> I've also just added a section with the stats that the Adobe Flash
> >> player exposes.
> >
> > Great. Perhaps Silverlight stats might be of use too - though they're fairly similar:
> >
> > http://learn.iis.net/page.aspx/582/advanced-logging-for-iis-70---client-logging/
> >
> >> Apart from the statistics that are not currently available from the
> >> HTML5 player, there are stats that are already available, such as
> >> currentSrc, currentTime, and all the events which can be turned into
> >> hooks for measurement.
> >
> > Yes, the network and ready states are very useful to determine if clients are stalling for buffering etc.
> >
> >> I think the page now has a lot of analysis of currently used stats -
> >> probably a sufficient amount. All the video publishing sites likely
> >> just use a subpart of the ones that Adobe Flash exposes in their
> >> analytics.
> >
> > Especially all the separate A/V bytecounts are overkill IMO.
> >
> > One useful metric I didn't list for JW Player but is very nice is Flash's "isLive" property.
> >
> > Kind regards,
> >
> > Jeroen
> >
> >
> >
> >
> >> On Thu, Apr 7, 2011 at 4:52 AM, Mark Watson <watsonm at netflix.com> wrote:
> >>> All,
> >>>
> >>> I added some material to the wiki page based on our experience here at Netflix and based on the metrics defined in MPEG DASH for adaptive streaming. I'd love to here what people think.
> >>>
> >>> Statistics about presentation/rendering seem to be covered, but what should also be considered are network performance statistics, which become increasingly difficult to collect from the server when sessions are making use of multiple servers, possibly across multiple CDNs.
> >>>
> >>> Another aspect important for performance management is error reporting. Some thoughts on that on the page.
> >>>
> >>> ...Mark
> >>>
> >>> On Mar 31, 2011, at 7:07 PM, Robert O'Callahan wrote:
> >>>
> >>>> On Fri, Apr 1, 2011 at 1:33 PM, Chris Pearce <chris at pearce.org.nz> wrote:
> >>>>
> >>>>> On 1/04/2011 12:22 p.m., Steve Lacey wrote:
> >>>>>
> >>>>>> Chris - in the mozilla stats, I agree on the need for a frame count of
> >>>>>> frames that actually make it the the screen, but am interested in why we
> >>>>>> need both presented and painted? Wouldn't just a simple 'presented' (i.e.
> >>>>>> presented to the user) suffice?
> >>>>>>
> >>>>>>
> >>>>> We distinguish between "painted" and "presented" so we have a measure of
> >>>>> the latency in our rendering pipeline. It's more for our benefit as browser
> >>>>> developers than for web developers.
> >>>>>
> >>>>
> >>>> Yeah, just to be clear, we don't necessarily think that everything in our
> >>>> stats API should be standardized. We should wait and see what authors
> >>>> actually use.
> >>>>
> >>>> Rob
> >>>> --
> >>>> "Now the Bereans were of more noble character than the Thessalonians, for
> >>>> they received the message with great eagerness and examined the Scriptures
> >>>> every day to see if what Paul said was true." [Acts 17:11]
> >>>>
> >>>
> >>>
> >
> >
>