ITU-T Recommendations

Recommendation ITU-T P.1203.3 specifies the quality integration module for Recommendation
ITU-T P.1203. The ITU-T P.1203 series of ITU-T Recommendations specify modules for monitoring
the audio, video and audiovisual quality of video services such as adaptive bit-rate video streaming.
The respective ITU-T work item has formerly been referred to as P.NATS (parametric non-intrusive
assessment of TCP-based multimedia streaming quality). The ITU-T P.1203.3 part of
Recommendation ITU-T P.1203 can be applied to the monitoring of performance and quality of
experience (QoE) of video services such as adaptive bit-rate video streaming. Besides stream-based
input information, the ITU-T P.1203.3 quality integration module takes the per-one-second video- and
audio-quality scores calculated according to ITU-T P.1203.1 and ITU-T P.1203.2, respectively,
as input.
Only one quality integration module is recommended for all four modes 0 to 3 of the Recommendation
ITU-T P.1203 model series, unique across all modes.
This Recommendation includes an electronic attachment containing the 20 trees described in
clause 8.4.
This revision to Recommendation ITU-T P.1203.3 (2007) replaces equation (20) in clause 8.3.
Amendment 1 introduces an adjustment of the audiovisual quality of ITU-T P.1203.3 for the case of
very low audio quality and long stalling events.
Corrigendum 1 introduces changes related to the qDirChangesLongest parameter in clause 8.1.2.5,
as well as equations 24 and 26.