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Network Working Group                                            G. Deen
Internet-Draft                                              NBCUniversal
Intended status: Informational                                 L. Daigle
Expires: September 22, 2016                 Thinking Cat Enterprises LLC
                                                          March 21, 2016


             Glass to Glass Internet Ecosysten Introduction
                       draft-deen-daigle-ggie-00

Abstract

   This document introduces the Glass to Glass Internet Ecosystem
   (GGIE).  The GGIE goal is to improve how the Internet is used for all
   video, both amateur and professional, reflecting that the line
   between amature and professional video technology is increasinly
   blurred.  As the Glass to Glass (camera lens to viewing screen) name
   implies GGIE's scope is from the original recording by a lens,
   through the steps of editing, packaging, distributed and searching,
   and finally viewing.  GGIE is not a complete end to end architecture
   or solution, it is use cases and technical specifications that can
   serve as foundational building blocks for new Internet video
   innovation.

   This is a companion effort to the GGIE W3C Taskforce in the W3C Web
   and TV Interest Group.

   This document is being discussed on the ggie@ietg.org mailing list.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at http://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on September 22, 2016.






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Copyright Notice

   Copyright (c) 2016 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Video is filling up the pipes . . . . . . . . . . . . . . . .   4
   4.  Video is different  . . . . . . . . . . . . . . . . . . . . .   4
   5.  Historical Approaches to supporting Video on the Internet . .   5
     5.1.  Video as an application . . . . . . . . . . . . . . . . .   5
     5.2.  Video as a network problem  . . . . . . . . . . . . . . .   6
   6.  GGIE: Building blocks to support video through network and
       application . . . . . . . . . . . . . . . . . . . . . . . . .   6
     6.1.  Affected IETF work areas  . . . . . . . . . . . . . . . .   7
     6.2.  Related work:  W3C GGIE Taskforce . . . . . . . . . . . .   7
   7.  Setting the stage for GGIE  . . . . . . . . . . . . . . . . .   7
     7.1.  Media Lifecycle . . . . . . . . . . . . . . . . . . . . .   8
     7.2.  Video is not like other Internet data . . . . . . . . . .  10
     7.3.  Video Transport . . . . . . . . . . . . . . . . . . . . .  12
   8.  Conclusion and Next Steps . . . . . . . . . . . . . . . . . .  12
   9.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  13
   10. IANA Considerations . . . . . . . . . . . . . . . . . . . . .  13
   11. Security Considerations . . . . . . . . . . . . . . . . . . .  13
   12. Normative References  . . . . . . . . . . . . . . . . . . . .  13
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  13

1.  Terminology

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in [RFC2119].







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2.  Introduction

   The proliferation of users with Internet connected devices capable of
   capturing, and devices for watching streamed video has created what
   is in terms of shear bandwidth the Internet's larget use without any
   close second competitor.  As of 2015 there are reports that youtube
   users upload over 500 hours of video every minute, and that during
   evening hours NetFlix accounts for a staggering 1/3 of Internet
   traffic.  The number of users using the Internet for both ends of the
   video create-view lifecycle grows daily worldwide, and this is
   creating an enormous strain put on the underlying Internet
   infrastructure at nearly every point from the core to the edge.

   While video is one of the most conceptually simple uses of the
   Internet, it is perhaps one of the most complex technically built
   from standards created by a large number of organizations and groups
   some dating from before the modern Internet even existed.  Many
   critical parts of this complex ecosystem were not created with either
   video's particular charateristics or vaste scale of populurity in
   mind which has lead to both the degradation of the viewer experience,
   and many Internet policy issues around access to bandwidth for video
   and the needed infrastructure to support the continued explosion in
   video transport on the Internet.

   Bandwidth increases at all levels of the Internet are expected to
   continue this is not currently, and is not expected to be the sole
   solution to the video scalability problem facing the Internet.  To
   meet future expectations work is also needed to find ways of more
   efficiently use the network for creation, publication, and delivery
   of video advances in existing technology and standards.

   Conceptually, people watch video when their play back device receives
   the encoded video data from a source, decodes it, and displays it for
   the viewer.  However, the technical details behind making this simple
   concept happen are often far from simple due video viewers demand for
   smooth display of video frame by frame in at a constant rate without
   delay or skipped frames.  Contiguous frames shown at a constant rate
   and the large size of video data combine to make distribution over
   Internet difficult and requiring sophisticated engineering to be done
   consistently well.

   This document outlines the scope of the video problem for the
   Internet, proposes that a path forward must include foundational
   building blocks for video at both the application and network layers,
   and provides an outline of the video production lifecycle as a
   baseline for developing a problem statement and requirements for IETF
   work on the Glass to Glass Internet Ecosystem (GGIE).




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3.  Video is filling up the pipes

   Video is without rival the top use of Internet bandwidth, and its
   ever growing demand for more bandwidth easily out paces the new
   capacity being added both globally and regionally with no let up in
   sight.

   Continuous innovation introducing new higher resolutions, higher
   video quality, new distribution services, new viewing and creation
   devices all contribute to this every growing demand upon the
   Internet.  The Cisco Visual Networking Index projects that by 2019
   there will be nearly a million minutes of video per second
   transported by the Internet, a making up 80-90 of all IP traffic.

   The growth in video bandwidth need is exceeding the growth in the
   bandwidth provisioning.

   Video has been the top use of Internet bandwidth for several years
   and is larger than the bandwidth used by all other applications
   combined.  This trend is not likely to ease or reverse itself as
   users of the Internet continue to make Internet transported video as
   one of their uses of the Internet, either for uploading and sharing
   video they creator, or as a primary sources for viewing video to a
   wide variety of viewing devices: computers, tablets, phones,
   connected televisions, game consoles, and AV receivers.

4.  Video is different

   Video is different than other data carried due to its extreme size of
   megabits per second, and gigebytes per hour of video, and when
   streamed for viewing its exteme sensitivity to latency and dropped
   packets.  This makes video unique amongst all other applications
   using the Internet for while some have latency and packet loss
   sensitivities they do not have exteme data sizes, and while others
   may have exteme data size they do not care about latency, time to
   restransmit lost packets, or in some cases loss of some individual
   packets at all.  A email user can tolerate an extra moment to
   retransmit dropped packets, and a web page user can tolerate a slow
   DNS lookup, but a video viewer sees both problems as jittery playback
   and as a failure of the network to meet their need.  (Audio has
   similar challenges in terms of intolerance of delay and jitter, but
   the data sizes are significantly smaller).

   Video data sizes continue to grow large as cameras and playback
   devices are able to capture and display higher quality images.  Early
   digital video was often captured at either 320x240 pixel resolution
   or 640x480 standard defintion resolution.  High definition or HD
   video at 1920x1080 became possible on some parts of the Internet



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   after 2011, although even in 2016 it remains unavailble or unreliable
   through many connections such as DSL and many mobile networks.
   Camera and player technology is currently expanding again to permit
   4K or 3840x2160 pixel resolution reflecting a 4x data increase over
   HD.

   Streaming is very demanding requiring consistent frame to frame
   playback in consistent constant time.  Advanced features such as
   pause, fast forward, rewind, slow motion, and fine scrubbing are
   considered by users as standard features players that the network
   must support and serve to further the challenge facing the Internet.

   New video abilities such as live streaming by users both one to one
   and one to many bring what has traditionally done professional
   broadcasters with dedicated broadcast infrastructure into the realm
   of every day users with connected smartphones using the Internet as a
   realtime global broadcast infrastructure.

5.  Historical Approaches to supporting Video on the Internet

5.1.  Video as an application

   Internet video engineering began by adapting preexisting standards
   used for over the air broadcast (OTA) and physical media.  Video
   encodings, such as AVI and MPEG2, originally designed for playback
   from local storage connected to the player where added to the data
   types carried by existing protocols like HTTP, and new protocols such
   as RTSP and HLS.  Early use of the Internet for video was a copy-and-
   play model replacing the use of OTA broadcast and physical media to
   copy video between systems.

   As Internet bandwidth grew sufficient to allow delivery of video data
   at the same rate it was being decoded, it became possible to stream
   video originally at very low resolutions such as 160x120 pixels (19.2
   kilopixels), eventually permitting standard defintion (SD) 640x480
   pixels (0.3 megapixels), and later high defintion of 1920x1080 pixels
   (2 gigapixels).  This trend continues with some providers beginning
   to offer 4K or 3840x2160 pixels (8.3 gigapixels) requiring very
   reliable and generous Internet bandwidth end to end connection
   between the viewer and source.

   Unlike the Web, email, and network file sharing which have been
   engineered and standardized in Internet focused organizations such as
   the W3C and IETF, video is dependent on standards developed by a very
   large number of groups, companies, and organizations which include
   the IETF, W3C but also MPEG, SMPTE, CEA, IEEE, ANSI, ISO, networking
   and technology companies, many others.  In contrast to the extensive
   end to end expert knowledge and engineering done to create the Web



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   and email, Internet video has largely been an evolved cobbling and
   adaption exercise done by engineers with their focus on a few, or
   one, particular aspect or problem at a time, and little interaction
   between other parts of the Internet video ecosystem.  While it is
   very much possible to deliver video over the Internet, this
   uncoordinated cobbling has resulted in many areas of inefficiency
   where engineering done from an end to end perspective provide the
   opportunity to vastly improve how video uses the Internet, which
   offers the hope of improving the quality of video and increasing the
   amount of video which can be delivered instead of relying solely on
   bandwidth growth to enable growth.

5.2.  Video as a network problem

   Network, video, and application engineers have constructed elaborate
   solutions for dealing with bandwidth and processing limitations,
   network congestion, lossy transport protocols, and the ever growing
   size of video data.  These solutions commonly fall into one of
   several solution types:

   1.  Reducing data sizes through resolution changes, compression, and
       more efficient encodings

   2.  Downloading before playing instead of realtime streaming

   3.  Positioning the data close to the viewer via caches, typically on
       the network edge

   4.  Fetching of video data at a rate faster than playback

   5.  Transport protocols that attempt to deliver video data such that
       the data arrives as if it were done on a congestion free/lossless
       network

   6.  Dynamic reselection of sources and transport routes on either a
       realtime or frequent intervals, 10-15 seconds, using player
       feedback mechanisms or network telemetry

6.  GGIE: Building blocks to support video through network and
    application

   GGIE, the Glass to Glass Internet Ecosystem, is an effort to improve
   video's use of the Internet by examining the end to end video
   ecosystem from the glass lens of the camera through to the glass the
   screen, and to identify areas of simplifications, standardization,
   and reengineering to make better use of bandwidth enabling smarter
   network use by video creators, distributors, and viewers.  GGIE is
   focused on how video uses the Internet, and not on how it is encoded



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   or compressed.  Like wise GGIE does not deal with content protection.
   GGIE scope however does include creator and viewer privacy, content
   identifiction and recognition as a means to enable smarter network
   usage, edge caching, and discoverability.

   Beyond improving the simplistic task of a viewer using the Internet
   to watch linear video, it is hoped, that through having a set of
   improved Internet video standards, the innovators can build using
   such standards as a foundation to create the next generation of
   Internet video such as multisource personalized composite
   experiences, interactive stories, and live personal broadcasting to
   name a few.

   Due to the very diverse and large deployment of existing video
   playback devices and infrastructure, it is viewed as essential that
   any evolved ecosystem continues to work with the majority of the
   legacy deployment.

6.1.  Affected IETF work areas

   It is expected that significant improvement is possible in the video
   transport ecosystem by modest evolution and adaption of existing
   standards for addressing, transporting, and routing of video data
   flows between sources and display.

6.2.  Related work: W3C GGIE Taskforce

   A companion effort was begun in 2015 in the W3C Web and TV Interest
   Group's GGIE Taskforce.  The W3C GGIE group developed a series of
   use-cases on discovery, search, delivery, identity, and metadata
   which can be found at https://www.w3.org/2011/webtv/wiki/GGIE_TF

7.  Setting the stage for GGIE

   This section outlines the details of the video lifecycle -- from
   creation to consumption -- including the key handholds for building
   applications and services around this complex data.  The section also
   provides more detail about the scope and requirements of video (scale
   of data, realtime requirements).

   Note: this document only deals with streaming video as used by
   movies, TV shows, news broadcasts, sports events, music concert
   broadcasts, product videos, personal videos, etc.  It does not deal
   with video conferencing or WebRTC style video transport.







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7.1.  Media Lifecycle

   The complex workflow of creating media and consuming it is
   decomposable into a series of distinct common phases.

7.1.1.  Capture

   The capture phase involves the original recording of the elements
   which will be edited together to make the final work.  Captured media
   elements can be static images, images with audio, audio only, video
   only, or video with audio.  In sophisticated capture scenarios more
   than one device maybe simulatneously recording.

7.1.1.1.  Capture Metadata

   The creation of metadata for the element, and for the final video
   begins at capture.  Typical basic capture metadata includes Camera
   ID, exposure, encoder, capture time, and capture format.  Some
   systems record GPS location data, assigned asset ids, assigned camera
   name, camera spatial location and orientation.

7.1.2.  Store

   The storage phase involves the transport and storage of captured
   elements data.  During the capture phase, an element is typically
   captured into memory in the capture device and is then stored onto
   persistent storage such as disc, SD or memory card.  Storage can
   involve network transport from the recording device to an external
   storage system using either storage over IP protocols such as iSCSI,
   a data transport such as FTP, or encapsulated data transport over a
   protocol such as HTTP.

   Storage systems can range from basic disk block storage, to
   sophisticated media asset libraries

7.1.2.1.  Storage Metadata

   Storage systems add to the metadata associated with media elements.
   For basic block storage, a file name, file size is typical, as is a
   hierarchical grouping, and creation date, last-access date.  For
   library system a identifier unique to the library is typical, a
   grouping by one or more attributes, a time stamp recording the
   addition to the library, and a last access time.








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7.1.3.  Edit

   Editing is the phase where one or more elements are combined and
   modified to create the final video work.  In the case of live
   streaming, the edit phase maybe bypassed.

7.1.4.  Package

   Packaging is the phase in which the work is encoded in one or more
   video and audio codecs.  These maybe produce multiple data files, or
   they may be combined into a single file container.  Typically it is
   in the packaging phase is the creation or registration of a unique
   work identifier for example an Entertainment Identifier from EIDR.

7.1.4.1.  Package Metadata

7.1.5.  Distribute

   The distribute phase is publishing or sharing the packaged work to
   viewers.  Often it is uploading it to a site such as YouTube, or
   Facebook for social media, or sending the packaged media to streaming
   sites such as Hulu.

   It is common for the distribution site to repackage the video often
   transcoding it to codecs and bitrates chosen by the distributor as
   more efficient for their needs.  Distribution of content expected to
   be widely viewed often includes prepositioning of the content on a
   CDN (Content Distribution Network).

   Distribution involves delivery of the video data to the viewer.

7.1.5.1.  Distribution Metadata

   Distribution often adds or changes considerable amounts of metadata.
   The distributor typically assigns a Content Identifier to the work,
   that is unique to the distributor and their content management system
   (CMS).  Additional actions by the distributor such as repacking and
   transcoding to new codecs or bitrates can require significant changes
   to the media metadata.

   A secondary use of distribution metadata is enabling easy discovery
   of the content either through a library catalog, EPG (electronic
   program guide), or search engine.  This phase often includes
   significant new metadata generation involving tagging the work by
   genre (sci-fi, drama, comedy), sub-genre (space opera, horror,
   fantasy), actors, director, release date, similar works, rating level
   (PG, PG-13), language level, etc.




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7.1.6.  Discover

   The discover phase is the precursor to viewing of the work.  It is
   where the viewer locates the work either through a library catalog, a
   playlist, an EPG, or a search.  The discover phase connects
   interested viewers with distribution sources.

7.1.6.1.  Discovery Metadata

   It is typical for discovery systems to parse media metadata to use
   the information as part of the discovery process.  Discovery systems
   may parse the content to extract imagery and audio as additional new
   metadata for the work to ease the viewers navigation of the discovery
   process perhaps as UI elements.  The system may import externally
   generated new metadata about the work and associate it in its search
   system, such as viewer reviews, metadata cross reference indices.

7.1.7.  View

   The view phase encompasses the consumption of the work from the
   distributor.  For Internet delivered video it is typical for delivery
   to involve a CDN to perform the actual delivery.

7.2.  Video is not like other Internet data

   Video is distinctly different from other Internet data.  There are a
   number of characteristics that contribute to video's unique Internet
   needs.  The most significant characteristics are:

   1.  large size of video data ( Mbps to Gbps)

   2.  low latency demands of streamed video

   3.  responsiveness to trick play requests by the user (stop, fast
       forward, fast reverse, jump ahead, jump back)

   4.  multiplicity of formats and encodings/bit rates that are
       acceptable substitutes for one another

7.2.1.  Data Sizes

   Simply put compared to all other common Internet data sizes, video is
   huge.  A still image often ranges from 100KB to 10MB.  A video file
   can commonly range from 100MB to 50GB.  Encoding and compression
   options permit streaming videos using bandwidth ranging from 700Kbps
   for extremely compressed SD video, to 1.5-3.0 Mbps for SD video, to
   2.5-6.0 Mbps for HD video, and 11-30Mbps for 4K video.




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   Still images have 4 dimensional properties that affect their data
   size:

   1.  number of horizontal X pixels

   2.  number of vertical Y pixels

   3.  bytes per pixel

   4.  compression factor for the image encoding.

   Video adds to this:

   1.  frames per second playback rate

   2.  visual continuity between frames (meaning users notice when
       frames are skipped or played out of order)

   3.  discontinguous jumps between frames such as skipping forward or
       backwards to inserting frames from other sources between
       contigous frames (advertisement placement)

   Each video format roughly increases by x4 the data needs of the
   previously resolution: (1) SD is 640x480 pixels; (2) HD is 1920x1080
   pixels; (3) 4K is 3840x2160 pixels.

   Video, like still images, assigns a number of pixels to store color
   and luminance information.  This currently evolving alongside
   resolutions after being stagnant for many years.  The introduction of
   high dynamic range videos or HDR has changed the color gamut for
   video and increased the number of bits needed to carry luminance from
   8 to 10 and in some formats more.

   Compression is often misunderstood by viewers.  Compression does not
   change the video resolution, SD is still 640x480 pixels, HD is still
   1980x1080 pixels.  What changes is the quality of the detail in each
   frame, and between frames.  Compression algorithms work with the
   video images and movement to reduce data sizes through encoding of
   repetitive and

   Video is in its simplest form a series of still images shown
   sequentially over time, adding an additional attribute to manage.

7.2.2.  Low Latency Transport

   Viewers demand that video plays back without any stutter, skips, or
   pauses, which translates into low latency transport for the video
   data.



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7.2.3.  Multiplicity of Acceptable Formats

   One of the unique aspects of video viewing is that there can exist
   multiple different encodings/versions of the same video, many of
   which are acceptable substitutes for one another.  This is a unique
   aspect of video viewing and differentiates video delivery from other
   data transports.

   An email is the email, this is what enables digital signatures to
   operate on the email body.  One composed and sent, there is only one
   version of the email which is the original, untouched, acceptable
   version of the email.

7.3.  Video Transport

7.3.1.  File vs Stream

   There are two common ways of transporting video on the Internet: 1)
   File based; 2) Streaming.  File based transport can use any file
   transport protocol with FTP and BitTorrent being two popular choices.
   Streaming

   File based playback involves copying a file and then playing it.
   There are schemes which permit playing portions of the file while it
   progressively is copied, but these schemes involve moving the file
   from A->B then playing on B.  FTP and BitTorrent are examples of file
   copy protocols.

   Streaming playback is most similar to a traditional Cable or OTA
   viewing of a video.  The video is delivered from the streaming
   service to the playback device in real time enabling the the playback
   device to receive, decode, and display the video data in real time.
   Communication between the player and the source enable pausing, fast
   forward, rewind by managing the data blocks which are sent to the
   player device.

8.  Conclusion and Next Steps

   GGIE seeks to held address this problem by establish standards based
   foundational building blocks that innovators can build upon creating
   smarter delivery and transport architectures instead of relying on
   raw bandwidth growth to satisfy video's growth.

   Next steps will include introducing for discusion issues relevant to
   the IETF based on use cases developed in the W3C GGIE Taskforce, as
   methods for enabling networks to identify video and enable smart
   routing and addressing choices by edge devices.




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9.  Acknowledgements

10.  IANA Considerations

   None (yet).

11.  Security Considerations

   None (yet).

12.  Normative References

   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119,
              DOI 10.17487/RFC2119, March 1997,
              <http://www.rfc-editor.org/info/rfc2119>.

Authors' Addresses

   Glenn Deen
   NBCUniversal

   Email: rgd.ietf@gmail.com


   Leslie Daigle
   Thinking Cat Enterprises LLC

   Email: ldaigle@thinkingcat.com






















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