ANSI SCTE 247 pdf free download
ANSI SCTE 247 pdf free download.High Dynamic Range (HDR) Video: System Requirements for Cable Phase 1 – Initial Deployment.
6. Introduction to High Dynamic Range Video
6.1. Video System Discussion
As noted in the Background section of this document, the end-to-end nature of video services necessitates that some latitude be afforded to the description of how this SCTE document fits within the scope of other SDO work.
High dynamic range video shall be considered in the context of modem cable systems, in which cable operators deliver a variety of video services (e.g., live linear channels and on-demand content) to a variety of consumer devices (e.g., cable STBs, smart TVs, PCs, tablets and smart phones) over different network infrastructures (e.g., the cable hybrid fiber-coax (HFC) plant, in-home DOCSIS/WiFi IP delivery and external internet connections such as wireless carriers’ 4G networks). In addition, DVR, “cloud DVR” and “start-over viewing” add complexity and technical requirements to the not-so-simple case of live linear channels.
The result is that modern cable systems must support many different, highly complex paths in which content must flow among various subsystems with cable operators’ plant. Moreover, cable operators exist in the middle of an entire end-to-end ecosystem in which many aspects of content production and consumer devices are beyond their control, but which impose certain technology constraints and limitations. In order to develop the requirements contained in this document, SCTE DVS scrutinized both live linear channels and on-demand content delivery on an end-to-end basis — from content production through various stages of delivery all the way to the consumer display. It is clear that the requirements for Next-generation cable systems need to take into account many important complexities and differences from the far simpler situation of purely on-demand delivery of pre-recorded content; and yet nextgeneration cable systems must provide a competitive viewing experience.
Cable operators also have a significant business in ad insertion for both programmer and broadcast channels, since they can perform geographically and/or demographically targeted ad insertion. Advertising segments used by cable operators come from a wide variety of national and local sources. Cable operators’ ad insertion systems and ad inventories must deal with the variety of source signals and video formats (e.g.. I ID 1080i [19], lID 720p [20]. SD [2 I]) that arc distributed by various programmers and broadcasters. Moreover, cable operators must be able to insert advertising in linear channels, bbstart over” playback. DVR playback, and on-demand viewing. The tecimical quality, complexity and latency shall meet both operational and business agreement needs.
In particular. content owners, programmers and advertisers are usually very concerned that the “creative intent” of their content be fully preserved by cable operators’ delivery to consumer displays. For example, UHD Alliance technical specifications associated with the “UltraHD Premium” logo require content, delivery and display using the ST-2084 PQ EOTF. Thus, while many format conversions can be performed technically, they may be prohibited or limited in certain ways by business agreements and the attempt to use a plethora of options may delay the timely roll out of HDR to consumers. Conversions that may he required among various I-IDR video systems are complex and their potential consequences drive many of’ the requirements in this document. This is more than just a consequence of content agreements. Simplifying operational complexity in the system is necessary to deploy HDR services in a timely manner and at scale, with the same expected customer experience (or better). The adoption of multiple formats affects the implementation scale in terms of transmission and storage (including ads). Likewise, multiple HDR implementations will complicate the insertion of ads and other existing and revenue—producing functions. In the spirit of crawl/walk/run, it is recommended that this document recommend only one electro-optical transfer function (EOTF) and one color space with limited metadata options for initial (phase 1) deployment.ANSI SCTE 247 pdf download.
