This Recommendation ITU-T P.1204.3 describes a bitstream-based mode 3 video quality model for monitoring the video quality for streaming using reliable transport (e.g. HTTP-based adaptive streaming over TCP, QUIC). The estimate is validated for videos encoded with H.264, H.265 or VP9 codecs at any resolution up to 4K/UHD resolution for PC monitors and TV and up to QHD (2560x1440) for Smartphone and Tablet displays. The standard provides sequence-related (between 5 to 10 sec.) and per-1-second video-quality estimation. In principle, the per-one-second outputs of this video-quality model 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, further into a final per-session model output, an estimate of integral per-session quality (see e.g. ITU-T Recs. P.1203, P.1203.2, P.1203.3). The respective ITU-T work item has formerly been referred to as "P.NATS Phase 2", and was conducted in collaboration between ITU-T Study Group 12 and the Video Quality Experts Group (VQEG). The ITU-T P.1204.3 Recommendation addresses three application areas: -Large-screen presentation as with fixed-network video streaming -Mobile streaming on handheld devices such as smartphones -Presentation on tablet-type devices

For the purpose of the AAP Last Call the electronic attachment to this Recommendation is located at https://www.itu.int/ifa/t/2017/sg12/exchange/plenary/AAP/P.1204.3-attachment.zip