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Video over IP Activity Group Report and Meeting. Video Services Forum October 1, 2001 New Orleans, LA. Video over IP AG Progress to Date. Developed draft mission statement Still a little work to do Researched applicable IETF RFCs Info to be distributed

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Video over ip activity group report and meeting

Video over IP Activity Group Report and Meeting

Video Services Forum

October 1, 2001

New Orleans, LA


Video over ip ag progress to date
Video over IP AG Progress to Date

  • Developed draft mission statement

    • Still a little work to do

  • Researched applicable IETF RFCs

    • Info to be distributed

  • Presentation made to ANSI T1A1.3 Committee in July regarding progress

  • T1A1.3 posting on “High Speed Video” over IP

  • Presentation to T1A1.3 in September

    • Authorized to write appendix to ANSI Y.1541 document


Draft mission statement
Draft Mission Statement

  • Identify the issues pertaining to sending and receiving contribution-quality, real-time, latency-sensitive digital television signals across multicarrier, IP-based networks, and develop the Video Services Forum position on such issues as are identified.


Mission statement controversy
Mission Statement Controversy

  • How high in the protocol stack to go?

    • Layer 2 & 3 for certain

    • Layer 4 or higher?

  • Which Layer 3 protocol(s)?

  • If Layer 4, which protocols?

    • RTP

    • DCP

    • new

  • Require MPLS/RSVP/DiffServ or not?

    • Prove interoperability on future networks…MPLS isn’t complete yet


Other mission statement observations
Other Mission Statement Observations

  • Distinguish between short-latencey and very-short-latency apps

    • Short-latency would be less than 500ms for one-way contribution video feeds

    • Very-short-latency would be less than 250ms for two-way video such as interviews

      • May be difficult to achieve

  • RTP encapsulation of CCIR-601 has an IETF spec (draft-ietf-avt-smpte292-video-03.txt)

    • More efficient if separated out Anc Data and moved it over its own synchronized path

    • Requires a new IETF spec


Additional video over ip concerns
Additional Video over IP concerns

  • Forward Error Correction

    • Can a generic FEC be applied? How strong an FEC is required vs. additional latency?

    • Need FEC experts in the group

  • Network-based genlocking

    • Requires new protocols

    • Create a set of requirements for isochronous system behavior


T1a1 3 activity
T1A1.3 Activity

  • John Grigg and Steve Storozum at Sept. meeting of IP QoS Performance WG

  • Presented argument for considering high-bandwidth video for a separate class of service

  • Argument rejected

    • Too late in process

    • More top-down analysis needed

      • Video performance requires what level of IP QoS?

    • However….


Video over ip wg receives t1a1 3 work request
Video over IP WG Receives T1A1.3 Work Request!

  • Invited to author an appendix to pending ITU Y.1541 document detailing requirements

  • If enough evidence is presented, high-speed video can be incorporated in body of document on next revision

  • Window of opportunity

    • If appendix is submitted by December, it will be published along with Y.1541 first release

    • Otherwise, will have to wait until October 2002 for next chance


What is needed
What is needed?

  • Empirical results of video over IP QoS testing

  • Testing to be conducted in a fair, vendor-independent fashion

  • Authoring the appendix around this testing will be required

  • All preferably in the next 45 days


Next steps for video over ip ag
Next steps for Video over IP AG

  • Final mission statement agreement

  • Author and issue Request for Technology to meet requirements in mission statement

  • Conduct tests on equipment and networks proposed as responses to RFT

  • Write final report on testing with recommendations for VSF position on Video over IP


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