[Bug 23169] reconsider the jitter video quality metrics again

https://www.w3.org/Bugs/Public/show_bug.cgi?id=23169

Jerry Smith <jdsmith@microsoft.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |REOPENED
         Resolution|FIXED                       |---

--- Comment #17 from Jerry Smith <jdsmith@microsoft.com> ---
Microsoft recommends that the frame delay metrics be double-precision with
units in seconds to match other timing variables used for media.  This matches
our implementation in IE11.

Doing this would require the following tweak to Displayed Frame Delay:

The delay between a frame's presentation time and the actual time it was
displayed, in a double-precision value in seconds & rounded to the nearest
display refresh interval. This delay is always greater than or equal to zero
since frames must never be displayed before their presentation time. Non-zero
delays are a sign of playback jitter and possible loss of A/V sync.

totalFrameDelay would similarly be double-precision in seconds as a summation
of the individual frame delays.

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Received on Tuesday, 3 December 2013 22:32:34 UTC