Wowza Community

How to measure video quality objectively

Want to measure the video quality (e.g. V-MOS, PEVQ) objectively for video conferencing/ video streams for webRTC endpoints.

Any opensrc tool available to capture the RTP data and measure the video quality? Please advise

Hello there and welcome to the Wowza support forum.

Please take a look at this module and see if it suits your needs:

Module to calculate bitrate of a video on demand stream

For live or static streams, the Quality of Service metrics in NetStream can show what you are actually consuming client-side:

import flash.net.NetStreamInfo;
// do this on interval or timer:
var nsi:NetStreamInfo;
nsi = netstream.info;
trace(nsi.dataBytesPerSecond);

For live streams, server-side, you can use IPerformanceCounter. There is getMessagesInCountRate() and getMessagesOutCountRate() which should give a snapshot.

Kind regards,

Salvadore

Thanks much for the help. I’m quite new to this. Let me discuss this stuff with my team. Will let you know the results.

Hi Salvadore,

trying to revisit this video quality issue.

I have a webRTC application to create a conf. room. After I created the conf, I get the following stats from the endpoint (my laptop Chrome browser):

Measurements Video

Codec VP8

Bit Rate (kbps) 762

Current RTT (ms) 94

Frame Rate Sent 30

Nacks Received 0

FIRs Received 19

PLIs Received 0

is there a formula/tool to compute the video quality in terms of an objective/quantative number to indicate the video is very good, acceptable or bad etc. ?

Appreciate your input.