How to measure video quality objectively

Wowza Streaming Engine
1

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

2

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

3

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.

4

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.