Network Working Group                                       A. Filippov
Internet Draft                                      Huawei Technologies
Intended status: Informational                            June 25, 2015
Expires: December 25, 2015



           <Video Codec Requirements and Evaluation Methodology>
                draft-filippov-netvc-requirements-00.txt


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), its areas, and its working groups.  Note that
   other groups may also distribute working documents as Internet-
   Drafts. The list of current Internet-Drafts can be accessed 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."

   The list of current Internet-Drafts can be accessed at 
   http://www.ietf.org/1id-abstracts.html

   The list of Internet-Draft Shadow Directories can be accessed at
   http://www.ietf.org/shadow.html

   This Internet-Draft will expire on November 25, 2015.

Copyright Notice

   Copyright (c) 2015 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.

Abstract

   This document provides requirements for a video codec designed
   mainly for use over the Internet. In addition, an evaluation



<Filippov>            Expires December 25, 2015                [Page 1]

Internet-Draft    Video Codec Requirements and Evaluation     June 2015


   methodology needed for measuring the parameters (codec performance,
   computational complexity, etc.) to ensure whether the stated
   requirements are fulfilled or not.

Table of Contents


   1. Introduction...................................................2
   2. Applications...................................................2
      2.1. Internet Protocol Television (IPTV).......................3
      2.2. Video conferencing........................................4
      2.3. Video sharing.............................................4
      2.4. Screencasting.............................................5
      2.5. Game streaming............................................6
      2.6. Video monitoring / surveillance...........................7
   3. Requirements...................................................8
      3.1. Basic requirements........................................9
      3.2. Optional requirements.....................................9
   4. Evaluation methodology........................................10
      4.1. Compression performance evaluation.......................10
   5. Security Considerations.......................................11
   6. Conclusions...................................................12
   7. References....................................................12
      7.1. Normative References.....................................12
      7.2. Informative References...................................12
   8. Acknowledgments...............................................13
   Appendix A. Abbreviations used in the text of this document......14
   Appendix B. Used terms...........................................15

1. Introduction

   In this document, the requirements for a video codec designed mainly
   for use over the Internet are presented. The requirements encompass
   a wide range of applications that use data transmission over the
   Internet including IPTV (broadcasting over IP-based networks), peer-
   video conferencing, video sharing, screencasting, and video
   monitoring/ surveillance. For each application, typical resolutions,
   frame-rates and picture access modes are presented. Specific
   requirements related to data transmission over packet-loss networks
   are considered as well.

2. Applications

   In this chapter, an overview of video codec applications that are
   currently available on the Internet market is presented. It is worth
   noting that there are different use cases for each application that
   define a target platform, and hence there are different types of


<Filippov>            Expires December 25, 2015                [Page 2]

Internet-Draft    Video Codec Requirements and Evaluation     June 2015


   communication channels involved (e.g., wired or wireless channels)
   that are characterized by different quality of service as well as
   bandwidth. The target platform and the channel bandwidth determine
   resolutions, frame-rates and quality or bit-rates for video streams
   to be encoded or decoded.



2.1. Internet Protocol Television (IPTV)

   This is a type of pre-recorded broadcasting over IP-based networks.
   Typical content used in this application is movies, cartoons,
   series, TV shows, etc. The main requirements are as follows:

   o  Random access to pictures, i.e. random access period (RAP) should
      be kept small enough (approximately, 1-15 seconds);

   o  Temporal (frame-rate) scalability;

   o  Error robustness.

   For this application, typical values of resolutions, frame-rates,
   and RAPs are presented in Table 1.

   +----------------------+-------------------------+-----------------+
   |      Resolution      |     Frame-rate, fps     |       PAM       |
   +----------------------+-------------------------+-----------------+
   +----------------------+-------------------------+-----------------+
   | 2160p (4K),3840x2160 |            30           |       RA        |
   +----------------------+-------------------------+-----------------+
   |   1080p, 1920x1080   |        24, 50, 60       |       RA        |
   +----------------------+-------------------------+-----------------+
   |    720p, 1280x720    |          50, 60         |       RA        |
   +----------------------+-------------------------+-----------------+
   | 576p (EDTV), 720x576 |          25, 50         |       RA        |
   +----------------------+-------------------------+-----------------+
   | 576i (SDTV), 720x576 |          25, 30         |       RA        |
   +----------------------+-------------------------+-----------------+
   | 480p (EDTV), 720x480 |          50, 60         |       RA        |
   +----------------------+-------------------------+-----------------+
   | 480i (SDTV), 720x480 |          25, 30         |       RA        |
   +----------------------+-------------------------+----------------+
   Table 1. IPTV: typical values of resolutions, frame-rates, and RAPs






<Filippov>            Expires December 25, 2015                [Page 3]

Internet-Draft    Video Codec Requirements and Evaluation     June 2015


2.2. Video conferencing

   This is a form of video connection over the Internet. This form
   allows users to establish connections to two or more people by two-
   way video and audio transmission for communication in real-time. For
   this application, both stationary and mobile devices can be used.
   The main requirements are as follows:

   o  Delay should be kept as low as possible (the preferable and
      maximum delay values should be less than 100 ms and 350 ms,
      respectively);

   o  Temporal (frame-rate) scalability;

   o  Error robustness.

   For this application, typical values of resolutions, frame-rates,
   and RAPs are presented in Table 2.

   +----------------------+-------------------------+----------------+
   |      Resolution      |     Frame-rate, fps     |      PAM       |
   +----------------------+-------------------------+----------------+
   +----------------------+-------------------------+----------------+
   |  1080p,  1920x1080   |          30             |     JFPIC      |
   +----------------------+-------------------------+----------------+
   |  720p,  1280x720     |          30, 60         |     JFPIC      |
   +----------------------+-------------------------+----------------+
   |  4CIF,  704x576      |          30, 60         |     JFPIC      |
   +----------------------+-------------------------+----------------+
   |  4SIF,  704x480      |          30, 60         |     JFPIC      |
   +----------------------+-------------------------+----------------+
   |  SIF,  352x240       |          30             |     JFPIC      |
   +----------------------+-------------------------+----------------+
   |  CIF,  352x288       |          30             |     JFPIC      |
   +----------------------+-------------------------+----------------+
   Table 2. Video conferencing: typical values of resolutions, frame-
   rates, and RAPs

2.3. Video sharing

   This is a service that allows people to upload and share video data
   (using live streaming or not) and to watch them. It is also known as
   video hosting. A typical scenario for this application is to capture
   video using mobile cameras such as GoPro or cameras integrated into
   smartphones (amateur video). The main requirements are as follows:

   o  Random access to pictures for downloaded video data;


<Filippov>            Expires December 25, 2015                [Page 4]

Internet-Draft    Video Codec Requirements and Evaluation     June 2015


   o  Temporal (frame-rate) scalability;

   o  Resolution and quality (SNR) scalability;

   o  Error robustness.

   For this application, typical values of resolutions, frame-rates,
   and RAPs are presented in Table 3.

   +----------------------+-------------------------+----------------+
   |      Resolution      |     Frame-rate, fps     |       PAM      |
   +----------------------+-------------------------+----------------+
   +----------------------+-------------------------+----------------+
   | 2160p (4K),3840x2160 |  24, 25, 30, 48, 50, 60 |       RA       |
   +----------------------+-------------------------+----------------+
   | 1440p (2K),2560x1440 |  24, 25, 30, 48, 50, 60 |       RA       |
   +----------------------+-------------------------+----------------+
   | 1080p, 1920x1080     |  24, 25, 30, 48, 50, 60 |       RA       |
   +----------------------+-------------------------+----------------+
   | 720p, 1280x720       |  24, 25, 30, 48, 50, 60 |       RA       |
   +----------------------+-------------------------+----------------+
   | 480p, 854x480        |  24, 25, 30, 48, 50, 60 |       RA       |
   +----------------------+-------------------------+----------------+
   | 360p, 640x360        |  24, 25, 30, 48, 50, 60 |       RA       |
   +----------------------+-------------------------+----------------+
   | 240p, 426x240        |  24, 25, 30, 48, 50, 60 |       RA       |
   +----------------------+-------------------------+----------------+
   | 144p, 256x144        |  24, 25, 30, 48, 50, 60 |       RA       |
   +----------------------+-------------------------+----------------+
   Table 3. Video sharing: typical values of resolutions, frame-rates
   [8, 9], and RAPs



2.4. Screencasting

   This is a service that allows users to record and distribute
   computer screen output. This service requires efficient compression
   of computer-generated content with high visual quality (up to
   visually and mathematically lossless) [1]. Currently, this
   application includes animation (cartoons, gaming content, data
   visualization, i.e. such a type of content that is characterized by
   fast motion, rotation, smooth shade, 3D effect, highly saturated
   colors with full resolution, clear textures and sharp edges with
   distinct colors [1]), virtual desktop infrastructure (VDI),
   screen/desktop sharing and collaboration, supervisory control and
   data acquisition (SCADA) display, automotive/navigation display,


<Filippov>            Expires December 25, 2015                [Page 5]

Internet-Draft    Video Codec Requirements and Evaluation     June 2015


   cloud gaming, factory automation display, wireless display, display
   wall, digital operating room (DiOR), etc. For this application, an
   important requirement is the support of a wide range of video
   formats including RGB and YUV 4:4:4 in addition to YUV 4:2:0 and
   YUV 4:2:2 [1]. For this application, typical values of resolutions,
   frame-rates, and RAPs are presented in Table 4.

   +----------------------+-------------------------+----------------+
   |      Resolution      |     Frame-rate, fps     |       PAM      |
   +----------------------+-------------------------+----------------+
   +----------------------+-------------------------+----------------+
   |                         RGB color format                        |
   +----------------------+-------------------------+----------------+
   | WQXGA, 2560x1600     |         60, 120         | AI, RA, JFPIC  |
   +----------------------+-------------------------+----------------+
   | WUXGA, 1920x1200     |         60, 120         | AI, RA, JFPIC  |
   +----------------------+-------------------------+----------------+
   | WSXGA+, 1680x1050    |         60, 120         | AI, RA, JFPIC  |
   +----------------------+-------------------------+----------------+
   | WXGA, 1280x800       |         60, 120         | AI, RA, JFPIC  |
   +----------------------+-------------------------+----------------+
   | SVGA, 800x600        |         60, 120         | AI, RA, JFPIC  |
   +----------------------+-------------------------+----------------+
   |                      YUV 4:4:4 color format                     |
   +----------------------+-------------------------+----------------+
   | 1440p (2K), 2560x1440|         30, 60          | AI, RA, JFPIC  |
   +----------------------+-------------------------+----------------+
   | 1080p, 1920x1080     |         30, 60          | AI, RA, JFPIC  |
   +----------------------+-------------------------+----------------+
   | 720p, 1280x720       |         30, 60          | AI, RA, JFPIC  |
   +----------------------+-------------------------+----------------+
   Table 4. Screencasting for RGB and YUV 4:4:4 format: typical values
   of resolutions, frame-rates, and RAPs

2.5. Game streaming

   This is a service that provides game content over the Internet to
   different local devices such as notebooks, gaming tablets, etc. In
   this category of applications, server renders 3D games in cloud
   server, and streams the game to any device with a wired or wireless
   broadband connection [2]. This allows anyone to play (or resume)
   full featured games from anywhere in the Internet [2]. An example of
   this application is Nvidia Grid [2]. Another category application is
   broadcast of video games played by people over the Internet in real
   time or for later viewing [2]. There are many companies such as
   Twitch, YY in China enable game broadcasting [2]. Games typically



<Filippov>            Expires December 25, 2015                [Page 6]

Internet-Draft    Video Codec Requirements and Evaluation     June 2015


   contain a lot of sharp edges and large motion [2]. The main
   requirements are as follows:

   o  Random access to pictures for downloaded video data;

   o  Temporal (frame-rate) scalability;

   o  Resolution and quality (SNR) scalability;

   o  Error robustness.

   For this application, typical values of resolutions, frame-rates,
   and RAPs are similar to ones presented in Table 4.

2.6. Video monitoring / surveillance

   This is a type of live broadcasting over IP-based networks. Video
   streams are sent to many receivers at the same time. A new receiver
   may connect to the stream at an arbitrary moment, so random access
   period should be kept small enough (approximately, ~1-5 seconds).
   Data are transmitted publicly in the case of video monitoring and
   privately in the case of video surveillance, respectively. For IP-
   cameras that have to capture, process and encode video data,
   complexity including computational and hardware complexity as well
   as memory bandwidth should be kept low to allow real-time
   processing. In addition, support of high dynamic range is an
   essential requirement for video surveillance. For this application,
   typical values of resolutions, frame-rates, and RAPs are presented
   in Table 5.

   +----------------------+-------------------------+-----------------+
   |      Resolution      |     Frame-rate, fps     |       PAM       |
   +----------------------+-------------------------+-----------------+
   +----------------------+-------------------------+-----------------+
   | 2160p (4K),3840x2160 |           12            |    RA, JFPIC    |
   +----------------------+-------------------------+-----------------+
   | 5Mpixels, 2560x1920  |           12            |       RA        |
   +----------------------+-------------------------+-----------------+
   | 1080p, 1920x1080     |           25            |       RA        |
   +----------------------+-------------------------+-----------------+
   | 1.3Mpixels, 1280x960 |         25, 30          |       RA        |
   +----------------------+-------------------------+-----------------+
   | 720p, 1280x720       |         25, 30          |       RA        |
   +----------------------+-------------------------+-----------------+
   | SVGA, 800x600        |         25, 30          |       RA        |
   +----------------------+-------------------------+-----------------+



<Filippov>            Expires December 25, 2015                [Page 7]

Internet-Draft    Video Codec Requirements and Evaluation     June 2015


   Table 5. Video monitoring / surveillance: typical values of
   resolutions, frame-rates, and RAPs

3. Requirements

   The most basic requirement is coding efficiency, i.e. compression
   performance. It should be better than for state-of-the-art video
   codecs such as HEVC/H.265 and VP9. Levels to be supported by the new
   codec are presented in Table 6.

   +------------------------------------------------------------------+
   |    Level    |  Example picture resolution at highest frame rate  |
   +-------------+----------------------------------------------------+
   |      1      |                128x96@30.0                         |
   |             |                176x144@15.0                        |
   +-------------+----------------------------------------------------+
   |      2      |                176x144@100.0                       |
   |             |                352x288@30.0                        |
   +-------------+----------------------------------------------------+
   |      3      |                352x288@60.0                        |
   |             |                640x360@30.0                        |
   +-------------+----------------------------------------------------+
   |             |                640x360@60.0                        |
   |      4      |                960x540@30.0                        |
   +-------------+----------------------------------------------------+
   |             |                720x576@75.0                        |
   |      5      |                960x540@60.0                        |
   |             |                1280x720@30.0                       |
   +-------------+----------------------------------------------------+
   |             |                1,280x720@68.0                      |
   |      6      |                2,048x1,080@30.0                    |
   +-------------+----------------------------------------------------+
   |             |                1,280x720@120.0                     |
   |      7      |                2,048x1,080@60.0                    |
   +-------------+----------------------------------------------------+
   |             |                1,920x1,080@120.0                   |
   |      8      |                3,840x2,160@30.0                    |
   |             |                4,096x2,160@30.0                    |
   +-------------+----------------------------------------------------+
   |             |                1,920x1,080@250.0                   |
   |      9      |                4,096x2,160@60.0                    |
   +-------------+----------------------------------------------------+
   |             |                1,920x1,080@300.0                   |
   |     10      |                4,096x2,160@120.0                   |
   +-------------+----------------------------------------------------+
   |             |                3,840x2,160@120.0                   |
   |     11      |                8,192x4,320@30.0                    |


<Filippov>            Expires December 25, 2015                [Page 8]

Internet-Draft    Video Codec Requirements and Evaluation     June 2015


   +-------------+----------------------------------------------------+
   |             |                3,840x2,160@250.0                   |
   |     12      |                8,192x4,320@60.0                    |
   +-------------+----------------------------------------------------+
   |             |                3,840x2,160@300.0                   |
   |     13      |                8,192x4,320@120.0                   |
   +-------------+----------------------------------------------------+

   Table 6. Codec levels

3.1. Basic requirements

   o  Bit depth: 8- and 10-bits per color component;

   o  Color sampling formats: YUV 4:2:0, YUV 4:2:2;

   o  Support of "low-delay" configurations (delay should be up to 350
      ms but its preferable value should be less than 100 ms);

   o  Feasible real-time implementation of both an encoder and a
      decoder for hardware and software implementation based on a wide
      range of state-of-the-art platforms;

   o  Temporal (frame-rate) scalability;

   o  Error resilience tools that are complementary to the error
      protection mechanisms implemented on transport level.

3.2. Optional requirements

   o  Bit depth: up to 16-bits per color component;

   o  Color sampling formats: YUV 4:4:4 and RGB;

   o  Alpha channel support;

   o  Support of high dynamic range;

   o  Resolution and quality (SNR) scalability.

   o  Computational complexity scalability, i.e. computational
      complexity is decreasing along with degrading picture quality.







<Filippov>            Expires December 25, 2015                [Page 9]

Internet-Draft    Video Codec Requirements and Evaluation     June 2015


4. Evaluation methodology

4.1. Compression performance evaluation

   As shown in Fig.1, compression performance testing is performed in 3
   ranges :

   o  Low bit-rate range (LBR) is the range that contains the 4 lowest
      bit-rates of the 6 specified bit-rates;

   o  Medium bit-rate range (MBR) is the range that contains the 4
      medium bit-rates of the 6 specified bit-rates;

   o  High bit-rate range (HBR) is the range that contains the 4
      highest bit-rates of the 6 specified bit-rates.

   To avoid any rate control mechanisms that can significantly impact
   compression performance, the deviation between bit-rates of
   reference and tested codecs should be less than the threshold value
   that should be defined in a separate document. This deviation is
   calculated as follows:

                   D = abs((BRr - BRt)/ BRr)*100%,

   where BRr and BRt are bit-rates of reference and tested codecs.

                                           Bit-rate
                      ---------------------------->
                      BR0  BR1  BR2  BR3  BR4  BR5
                      ^    ^    ^      ^    ^    ^
                      |----+-LBR+------|    |    |
                           |----+-MBR-------|    |
                                |------HBR-------|

                 Figure 1 Bit-rate ranges for the CBR mode














<Filippov>            Expires December 25, 2015               [Page 10]

Internet-Draft    Video Codec Requirements and Evaluation     June 2015


   To assess the quality of output (decoded) sequences, two indexes,
   PSNR [3] and MS-SSIM [3,11], should be separately calculated for
   each color plane. For obtaining an integral estimation, BD-rate [4]
   should be computed for each range and each quality index. Finally,
   18 values should be obtained for a color format, which contains 3
   color planes (e.g., for YUV or RGB). A list of video sequences that
   should be used for testing as well as the 6 values of bit-rates are
   defined in a separate document. It should use the information on the
   codec applications presented in this document. As the reference for
   evaluation, the HEVC/H.265 codec [5,6] must be used. The reference
   source code of the HEVC/H.265 codec can be found at [7]. The
   HEVC/H.265 codec must be configured according to [8] and Table 9.

   +----------------------+-------------------------------------------+
   | Intra-period, second | HEVC/H.265 encoding mode according to [7] |
   +----------------------+-------------------------------------------+
   |          AI          |        Intra Main or Intra Main10         |
   +----------------------+-------------------------------------------+
   |          RA          |           Random access Main or           |
   |                      |           Random access Main10            |
   +----------------------+-------------------------------------------+
   |        JFPIC         |             Low delay Main or             |
   |                      |             Low delay Main10              |
   +----------------------+-------------------------------------------+

   Table 9. Intra-periods for different HEVC/H.265 encoding modes
   according to [8]

   In addition to the objective quality measures defined above,
   subjective evaluation must also be performed before adopting any new
   tool and a final codec standard. For subjective tests, the MOS-based
   evaluation procedure must be used as described in section 2.1 of
   [3]. For perception-oriented tools that primarily impact subjective
   quality, additional tests may also be individually assigned even for
   intermediate evaluation, subject to a decision of the NETVC WG.



5. Security Considerations

   This document itself does not have any security considerations.
   However, it is worth noting that a codec implementation (for both an
   encoder and a decoder) should cover the worst case of computational
   complexity, memory bandwidth, and physical memory size (e.g., for
   decoded pictures used as references). Otherwise, it can be
   considered as a security vulnerability and lead to denial-of-service
   (DoS) in the case of attacks.


<Filippov>            Expires December 25, 2015               [Page 11]

Internet-Draft    Video Codec Requirements and Evaluation     June 2015


6. Conclusions

   In this document, an overview of Internet video codec applications
   and typical use cases as well as a prioritized list of requirements
   for an Internet video codec are presented. An evaluation methodology
   for this codec is also proposed.

7. References

7.1. Normative References

   [1]   H. Yu, K. McCann, R. Cohen, and P. Amon, "Requirements for
         future extensions of HEVC in coding screen content", ISO/IEC
         JTC1/SC29/WG11 MPEG2013/N14174, San Jose, USA, Jan. 2014

   [2]   Manindra Parhy, "Game streaming requirement for Future Video
         Coding," MPEG Contribution m36771, June 2015, Warsaw, Poland.

   [3]   ISO/IEC PDTR 29170-1: Information technology -- Advanced image
         coding and evaluation methodologies -- Part 1: Guidelines for
         codec evaluation.

   [4]   G. Bjontegaard, "Calculation of average PSNR differences
         between RD-curves (VCEG-M33)," in VCEG Meeting (ITU-T SG16
         Q.6), Austin, Texas, USA, Apr. 2-4 2001.

   [5]   ISO/IEC 23008-2:2015. Information technology -- High
         efficiency coding and media delivery in heterogeneous
         environments -- Part 2: High efficiency video coding

   [6]   Recommendation ITU-T H.265: High efficiency video coding,
         2013.

   [7]   https://hevc.hhi.fraunhofer.de/svn/svn_HEVCSoftware/

   [8]   F. Bossen, "Common test conditions and software reference
         configurations," JCTVC-L1100, Geneva, Switzerland, Jan. 2013.

7.2. Informative References

   [9]   "Recommended upload encoding settings (Advanced)"
         https://support.google.com/youtube/answer/1722171?hl=en

   [10]  "YouTube introduces 144p resolution on some videos"
         http://www.youtube.com/watch?v=2ZMRkGbrB3c




<Filippov>            Expires December 25, 2015               [Page 12]

Internet-Draft    Video Codec Requirements and Evaluation     June 2015


   [11]  Z. Wang, E. P. Simoncelli, and A. C. Bovik, "Multi-scale
         structural similarity for image quality assessment," Invited
         Paper, IEEE Asilomar Conference on Signals, Systems and
         Computers, Nov. 2003, Vol. 2, pp. 1398-1402.

   [12]  http://www.digitizationguidelines.gov/term.php?term=compressio
         nvisuallylossless)

8. Acknowledgments

   The author would like to thank Jiantong Zhou, Paul Coverdale, Vasily
   Rufitskiy, Dr. Haitao Yang, Viktor Stepin, Maxim Sychev, and Sergey
   Ikonin for many useful discussions on this document and their help
   while preparing it.

   This document was prepared using 2-Word-v2.0.template.dot.

































<Filippov>            Expires December 25, 2015               [Page 13]

Internet-Draft    Video Codec Requirements and Evaluation     June 2015


Appendix A.                 Abbreviations used in the text of this document

   +--------------+---------------------------------------------------+
   | Abbreviation |                      Meaning                      |
   +--------------+---------------------------------------------------+
   |      AI      | All-Intra (each picture is intra-coded)           |
   |   BD-Rate    | Bjontegaard Delta Rate                            |
   |     GOP      | Group of Picture                                  |
   |     HBR      | High Bit-rate Range                               |
   |     PAM      | Picture Access Mode                               |
   |      RA      | Random Access                                     |
   |     RAP      | Random Access Period                              |
   |     IPTV     | Internet Protocol Television                      |
   |    JFPIC     | Just the First Picture is Intra-Coded             |
   |     LBR      | Low Bit-rate Range                                |
   |     MBR      | Medium Bit-rate Range                             |
   |     MOS      | Mean Opinion Score                                |
   |   MS-SSIM    | Multi-Scale Structural Similarity quality index   |
   |     PSNR     | Peak Signal-to-Noise Ratio                        |
   +--------------+---------------------------------------------------+





























<Filippov>            Expires December 25, 2015               [Page 14]

Internet-Draft    Video Codec Requirements and Evaluation     June 2015


Appendix B.                 Used terms

   +------------------+-----------------------------------------------+
   |      Term        |                   Meaning                     |
   +------------------+-----------------------------------------------+
   |  Random access   | is the period of time between two closest     |
   |  period          | independently decodable frames (pictures).    |
   |                  |                                               |
   | Visually         | is a form or manner of lossy compression      |
   | lossless         | where the data that are lost after the file   |
   | compression      | is compressed and decompressed is not         |
   |                  | detectable to the eye; the compressed data    |
   |                  | appearing identical to the uncompressed       |
   |                  | data [12].                                    |
   +------------------+-----------------------------------------------+


































<Filippov>            Expires December 25, 2015               [Page 15]

Internet-Draft    Video Codec Requirements and Evaluation     June 2015


Authors' Addresses

   Alexey Filippov
   Huawei Technologies

   Email: alexey.filippov@huawei.com


 
 
  

   
 



































<Filippov>            Expires December 25, 2015               [Page 16]