# How to measure video quality objectively

**URL:** <https://community.wowza.com/t/how-to-measure-video-quality-objectively/44522>\
**Category:** Wowza Streaming Engine\
**Created:** [January 6, 2015, 7:44pm UTC](https://community.wowza.com/t/how-to-measure-video-quality-objectively/44522 "2015-01-06T19:44:17Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Sahara\_Sahara](https://avatars.discourse-cdn.com/v4/letter/s/6a8cbe/32.png) [@Sahara\_Sahara](https://community.wowza.com/u/Sahara_Sahara)\
**Post date:** [January 6, 2015, 7:44pm UTC](https://community.wowza.com/t/how-to-measure-video-quality-objectively/44522/1 "2015-01-06T19:44:17Z")

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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

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**Author:** ![sal\_jefferson](https://avatars.discourse-cdn.com/v4/letter/s/6de8d8/32.png) [@sal\_jefferson](https://community.wowza.com/u/sal_jefferson)\
**Post date:** [January 7, 2015, 8:38am UTC](https://community.wowza.com/t/how-to-measure-video-quality-objectively/44522/2 "2015-01-07T08:38:29Z")

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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](http://community.wowza.com/t/-/80)

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

```auto
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

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<div class="post-metadata">

**Author:** ![Sahara\_Sahara](https://avatars.discourse-cdn.com/v4/letter/s/6a8cbe/32.png) [@Sahara\_Sahara](https://community.wowza.com/u/Sahara_Sahara)\
**Post date:** [January 9, 2015, 12:20am UTC](https://community.wowza.com/t/how-to-measure-video-quality-objectively/44522/3 "2015-01-09T00:20:13Z")

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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.

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<div class="post-metadata">

**Author:** ![Sahara\_Sahara](https://avatars.discourse-cdn.com/v4/letter/s/6a8cbe/32.png) [@Sahara\_Sahara](https://community.wowza.com/u/Sahara_Sahara)\
**Post date:** [February 19, 2015, 11:04am UTC](https://community.wowza.com/t/how-to-measure-video-quality-objectively/44522/4 "2015-02-19T11:04:03Z")

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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.