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[webrtc-stats] Add QP statistics to video tracks

From: Harald Alvestrand via GitHub <sysbot+gh@w3.org>
Date: Tue, 09 Aug 2016 13:32:35 +0000
To: public-webrtc@w3.org
Message-ID: <issues.opened-170166937-1470749553-sysbot+gh@w3.org>
alvestrand has just created a new issue for 
https://github.com/w3c/webrtc-stats:

== Add QP statistics to video tracks ==
>From Sami Kalliomäki <sakal@google.com>:

What we need is a way to get average QP over some period of time. I 
don't think adding this to the receiver side is needed by us but maybe
 it should be added as well. I think the approach of adding a sum of 
QP would be a good idea. It probably should be added to the 
RTCMediaStreamTrackStats structure. Maybe something like this:

qpSum of type unsigned long
Only valid for video. QP (quantization parameter) describes how much 
spatial detail is included a frame. Low value corresponds with good 
quality. The range of the value per frame is defined by the codec 
being used. This parameter represents the sum of all QPs for 
framesDecoded on remote streams and framesSent on local streams.

The average QP has been implemented before as a goog stat but it never
 landed. The relevant CLs are here:
https://codereview.webrtc.org/1264693003/
https://codereview.webrtc.org/1420963005/


Please view or discuss this issue at 
https://github.com/w3c/webrtc-stats/issues/57 using your GitHub 
account
Received on Tuesday, 9 August 2016 13:32:45 UTC

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