This is part two in a set of documents that specifies the motivational drivers, use cases, and standards for a configuration interface to facilitate interoperability within the content delivery network (CDN) and open caching ecosystem. This document presents the context and requirements for extending the Content Delivery Network Interconnection (CDNi) . . . Read more
Content Delivery Network (CDN) is a data network optimized for the delivery of content, e.g. video, at a large scale. Comprised of both hardware and software components.
Digital Rights Management is the use of keys and certificates to authorize playback of a video stream to a specific user and/or device over IP streaming like OTT.
Group of Pictures (GOP) is a collection of successive pictures within a coded video stream. It is composed of I, P, B and D frames which are composing the GOP structure.
A Perceptual Video Quality (PVQ) evaluation technique, based on mathematical models, where computer algorithms rate the quality of the video, i.e., video quality is not rated by human subjects (see Subjective Quality Assessment). Objective Video Quality assessments strive to approximate Subjective Video Quality results. Objective Video Quality evaluations can be . . . Read more
Over-The-Top (OTT) is a term used to describe video services which are taking leverage of the user internet access. It can be either deployed over managed or non managed network. OTT bypasses cable, broadcast, and satellite television platforms, the companies that traditionally act as a controller or distributor of such . . . Read more
Trick play is a feature of digital video systems that mimic the visual feedback given during fast-forward, pause and rewind operations that were provided by analog systems, such as VCRs and in multiple speeds.
Transport Stream is a container format encapsulating packetized elementary streams of audio, video and other data for transmission and storage purposes. It is the main format in digital satellite, cable and IPTV.
User Datagram Protocol (UDP) is one of the main transport protocols used in IP networks. It corresponds to Layer 4 in the OSI 7-layer model of the networking stack. It is a “stateless” or “connectionless” protocol which means that features such as retransmission and flow control, if desired, must be . . . Read more
VOD systems allow users to select and watch video content over a network as part of an interactive television system. VOD systems either “stream” content, allowing viewing while the video is being downloaded, or “download” it so that the whole program is brought to a device before viewing starts. All . . . Read more
