mos

inboundoutboundaudio

The Mean Opinion Score (MOS) of an audio stream.

Description

Real number; Between 1 to 5

MUST NOT exist for video (this is audio only).

MOS is a metric that represents the quality of audio (and/or video) communication as perceived by the user. It is traditionally measured by having users rate the quality of a call on a scale of 1 to 5, where:

  • 1 = Bad
  • 2 = Poor
  • 3 = Fair
  • 4 = Good
  • 5 = Excellent

This subjective feedback is then averaged across multiple users to obtain a mean opinion score.

See also

Notes

  • MOS is calculated independently by rtcStats and is not part of the metrics that WebRTC offers out of the box. The calculation is based on audio related metrics such as jitter, RTT and packet loss
  • rtcStats' MOS score calculation is different for each voice codec used