Summary

Recommendation ITU-T P.1204.5 describes the hybrid no-reference video quality estimation model for monitoring the video quality for streaming using reliable transport (e.g., adaptive streaming (HAS) based on hypertext transfer protocol (HTTP) �over the transmission control protocol (TCP) or quick user datagram protocol Internet connections (QUIC)). The estimate is validated for videos encoded with ITU-T H.264, ITU-T H.265, video payload type 9 (VP9) or AOMedia Video 1 (AV1) codecs at any resolution up to 4K/ultra-high definition-1 (UHD-1) resolution for personal computer (PC) monitors and television (TV) and up to 2 560 � 1 440 for mobile (MO) and tablet (TA) displays.

The ITU-T P.1204.x series of Recommendations provide sequence-related (between 5 s and 10 s) and per-1-second video quality estimation. In principle, the per-one-second outputs of these video quality models can be used together with an audio model for integration into audiovisual quality and, together with information about initial-loading delay and media playout stalling events, combined further into a final per-session model output, an estimate of integral per-session quality (see, for example, [b‑ITU‑T P.1203], [b-ITU-T P.1203.2], [b-ITU-T P.1203.3]).

Recommendation ITU-T P.1204.5 was developed in collaboration with the Video Quality Experts Group (VQEG).

The ITU-T P.1204.x-series of Recommendations addresses three application areas:

����������� Large-screen presentation with fixed-network video streaming;

����������� Mobile streaming on handheld devices such as smartphones;

����������� Presentation on tablet-type devices.