Time to First Byte (TTFB) refers to the time between the browser requesting a resource (i.e., a webpage, a video manifest, a video segment) and when it receives the first byte of information from the server. This time includes DNS lookup and establishing the connection using a TCP handshake and TLS handshake if the request is made
Domain model for monitoring of Perceptual Video Quality (PVQ).
High level view of video streaming workflow for live content.
Measure of time between request for media by player to time media is rendered for playback (e.g. first frame rendered for user).
Measure of total time for network request (e.g. for a media object) to travel over the network and for response to travel back.
Quick UDP Internet Connections is a UDP-based transport layer network protocol. HTTP/3 uses QUIC to achieve performance enhancements (e.g. simpler handshakes, multiplexing) such as lower latency media streaming.
Measure of underlying technical aspects or characteristics of media streaming (ITU.T P.10 item 6.212), including: performance, availability. Poor QoS can impact PVQ and/or QoE. In contrast to QoE, QoS is an expression of the system’s various technical characteristics including: network performance (e.g. packet loss, e.g. network jitter, e.g. bitrate, e.g.
Quality of Experience is a measure of overall delight or annoyance of viewer’s media streaming experience (ITU.T P.10 item 6.209). Many factors can impact QoE, including: poor PVQ, poor QoS, poor application performance. In contrast to QoS, QoE is an expression of the end-viewer’s overall sentiment regarding the usage of
Measure of visual quality of video content as perceived by viewers. Poor PVQ can impact QoE. Poor QoS can impact PVQ. The perceived video quality can be evaluated by computers based on mathematical models in laboratory or production settings (see Objective Video Quality) or based on human observation in informal
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