Audio/Video Transport (avt)

In addition to this official charter maintained by the IETF Secretariat, there is additional information about this working group on the Web at:

       RTP FAQ Page

Last Modified: 2006-07-05

Chair(s):

  • Colin Perkins <csp@csperkins.org>

  • Tom Taylor <taylor@nortel.com>

  • Roni Even <roni.even@polycom.co.il>

    Real-time Applications and Infrastructure Area Director(s):

  • Jon Peterson <jon.peterson@neustar.biz>
  • Cullen Jennings <fluffy@cisco.com>

    Real-time Applications and Infrastructure Area Advisor:

  • Cullen Jennings <fluffy@cisco.com>

    Mailing Lists:

    General Discussion: avt@ietf.org
    To Subscribe: https://www1.ietf.org/mailman//listinfo/avt
    Archive: http://www.ietf.org/mail-archive/web/avt/index.html

    Description of Working Group:

    The Audio/Video Transport Working Group was formed to specify a
    protocol for real-time transmission of audio and video over unicast
    and multicast UDP/IP. This is the Real-time Transport Protocol, RTP,
    together with its associated profiles and payload formats. The
    current aims of the working group are: 

    - to review and revise existing payload formats to advance those
      which are useful to Draft Standard, and to declare others
      as Historic. Milestones will be established as a champion for
      each payload format is identified.

    - to develop payload formats for new media codecs, and to
      document best-current practices in payload format design.
      The group continues to be precluded from work on codecs
      themselves because of overlap with the other standards
      bodies, and because the IETF does not have the ability
      to effectively review new codecs. An exception was made
      for the freeware iLBC codec on a highly experimental basis,
      but acceptance of new codec work is unexpected and subject
      to rechartering.

    - to complete the forward error correction work to update
      RFC 2733 in the form of the ULP payload format

    - to investigate and if suitable develop a framework for advanced
      FEC codes and their usage for RTP, possibly with alignment to
      the RMT WG's FEC building block.

    - to extend RTP to work with Source-Specific Multicast sessions
      with unicast feedback

    - to provide a framing mechanism for RTP over TCP and TLS

    - in collaboration with the MPLS and ROHC WGs, to develop a solution
      for header compression of RTP across MPLS networks that avoid
      decompression and compression at each MPLS node.

    - to develop a new RTP profile as the combination of the SRTP
      profile and the Extended RTP Profile for RTCP-based Feedback
      (RTP/SAVPF)

    - to develop a new RTP profile for usage of TFRC (RFC 3448) with
      RTP over UDP to allow application developers to gain experience
      with TCP friendly congestion control.
     
    - to develop a MIB for RTCP XR (RFC 3611).

    - to update the RTP MIB, including aligning it with RFC 3550.

    The longer term goals of the working group are to advance the
    SRTP Profile, the Extended RTP Profile for RTCP-based Feedback,
    the Compressed RTP framework, and the RTP MIB to Draft Standard.

    The group has no plans to develop new RTP profiles beyond those
    listed above, but will consider rechartering to produce profile
    level extensions if appropriate.

    Goals and Milestones:

    Done  Review DCCP including prototypes and API; feedback to DCCP WG
    Done  Initial draft requirements for ECRTP over MPLS; discuss with MPLS WG
    Done  Submit iLBC payload format for Proposed Standard
    Done  Submit iLBC codec specification for Experimental
    Done  Advance RTP specification and A/V profile to Full Standard
    Done  Submit RTP/SAVPF profile for Proposed Standard
    Nov 2005  Submit ULP Payload Format for Proposed Standard
    Done  Finished investigation of advanced FEC codes for RTP, update plan
    Dec 2005  Submit any extensions for RTP HC on MPLS networks for Proposed Standard
    Mar 2006  Submit RTCP/SSM draft for Proposed Standard
    Mar 2006  Submit SRTP for Draft Standard
    Mar 2006  Submit RTP Profile for TFRC for Proposed Standard
    Aug 2006  Submit update of RTP MIB for Proposed or Draft Standard
    Aug 2006  Submit RTCP XR MIB for Proposed Standard
    Sep 2006  Submit RTP/AVPF for Draft Standard

    Internet-Drafts:

    RTP Payload Format for Generic Forward Error Correction (96848 bytes)
    RTCP Extensions for Single-Source Multicast Sessions with Unicast Feedback (145498 bytes)
    RTP Retransmission Payload Format (80019 bytes)
    RTP Payload Format for JPEG 2000 Video Streams (60003 bytes)
    RTP Payload for DTMF Digits, Telephony Tones and Telephony Signals (124512 bytes)
    Extended Secure RTP Profile for RTCP-based Feedback (RTP/SAVPF) (40573 bytes)
    An Implementation Guide for RTP MIDI (82569 bytes)
    RTP Payload Format for MIDI (390208 bytes)
    RTP Payload Format for ITU-T Rec. H.263 Video (66105 bytes)
    RTP Payload Format for H.261 Video Streams (39350 bytes)
    RTP Payload Format for ATRAC Family (59758 bytes)
    RTP Payload Format for H.263 using RFC2190 to Historic status (9844 bytes)
    RTP Control Protocol Extended Reports (RTCP XR) VoIP Metrics Management Information Base (80227 bytes)
    RTP Payload Format and File Storage Format for the Adaptive Multi-Rate (AMR) and Adaptive Multi-Rate Wideband (AMR-WB) Audio Codecs (139558 bytes)
    Definition of Events For Modem, FAX, and Text Telephony Signals (119259 bytes)
    Definition of Events For Channel-Oriented Telephony Signalling (55179 bytes)
    Payload Format for JPEG 2000 Video: Extensions for Scalability and Main Header Recovery (51430 bytes)
    Media Type Registration of RTP Payload Formats (21345 bytes)
    Protocol Extensions for Header Compression over MPLS (75940 bytes)
    Associating SMPTE time-codes with RTP streams (24959 bytes)
    A general mechanism for RTP Header Extensions (21853 bytes)
    RTP Payload Format for ITU-T Recommendation G.722.1 (22247 bytes)
    RTP payload format for the G.729.1 audio codec (31834 bytes)
    Enhancements to RTP Payload Formats for EVRC Family Codecs (43080 bytes)
    RTP Payload Format for E-AC-3 Audio (41135 bytes)
    RTP Payload Format for Vorbis Encoded Audio (51305 bytes)
    Real-time Transport Protocol (RTP) MIB Version 2 (65253 bytes)
    Media Type Registration of Payload Formats in the RTP Profile for Audio and Video Conferences (43896 bytes)
    How to Write an RTP Payload Format (97394 bytes)

    Request For Comments:

    RTP: A Transport Protocol for Real-Time Applications (RFC 1889) (188544 bytes) obsoleted by RFC 3550
    RTP Profile for Audio and Video Conferences with Minimal Control (RFC 1890) (37509 bytes) obsoleted by RFC 3551
    RTP Payload Format for JPEG-compressed Video (RFC 2035) (30275 bytes) obsoleted by RFC 2435
    RTP payload format for H.261 video streams (RFC 2032) (27408 bytes)
    RTP Payload Format for MPEG1/MPEG2 Video (RFC 2038) (23266 bytes) obsoleted by RFC 2250
    RTP Payload Format of Sun's CellB Video Encoding (RFC 2029) (11216 bytes)
    RTP Payload Format for H.263 Video Streams (RFC 2190) (26409 bytes)
    RTP Payload for Redundant Audio Data (RFC 2198) (25166 bytes)
    RTP Payload Format for MPEG1/MPEG2 Video (RFC 2250) (34293 bytes) obsoletes RFC 2038
    RTP Payload Format for Bundled MPEG (RFC 2343) (16557 bytes)
    Options for Repair of Streaming Media (RFC 2354) (28875 bytes)
    RTP Payload Format for the 1998 Version of ITU-T Rec. H.263 Video (H.263+) (RFC 2429) (43166 bytes)
    RTP Payload Format for BT.656 Video Encoding (RFC 2431) (22323 bytes)
    RTP Payload Format for JPEG-compressed Video (RFC 2435) (54173 bytes) obsoletes RFC 2035
    Compressing IP/UDP/RTP Headers for Low-Speed Serial Links (RFC 2508) (60474 bytes)
    An RTP Payload Format for Generic Forward Error Correction (RFC 2733) (53120 bytes)
    Guidelines for Writers of RTP Payload Format Specifications (RFC 2736) (24143 bytes)
    Sampling of the Group Membership in RTP (RFC 2762) (25796 bytes)
    RTP Payload for Text Conversation (RFC 2793) (20674 bytes) obsoleted by RFC 4103
    RTP Payload for DTMF Digits, Telephony Tones and Telephony Signals (RFC 2833) (68786 bytes)
    RTP Payload Format for Real-Time Pointers (RFC 2862) (12031 bytes)
    Real-Time Transport Protocol Management Information Base (RFC 2959) (62063 bytes)
    Registration of parityfec MIME types (RFC 3009) (16022 bytes)
    RTP payload format for MPEG-4 Audio/Visual streams (RFC 3016) (47070 bytes)
    RTP Payload Format for ITU-T Recommendation G.722.1 (RFC 3047) (16292 bytes)
    A More Loss-Tolerant RTP Payload Format for MP3 Audio (RFC 3119) (37796 bytes)
    RTP Testing Strategies (RFC 3158) (48208 bytes)
    RTP Payload Format for DV Format Video (RFC 3189) (25991 bytes)
    RTP Payload Format for 12-bit DAT, 20- and 24-bit Linear Sampled Audio (RFC 3190) (34977 bytes)
    RTP payload format and file storage format for the Adoptive Multi-Rate (AMR) and Adaptive Multi-Rate Wideband (AMR-WB) audio codecs (RFC 3267) (110652 bytes)
    RTP Payload for Comfort Noise (RFC 3389) (17018 bytes)
    RTP Payload Format for Society of Motion Picture and Television Engineers (SMPTE) 292M Video (RFC 3497) (26094 bytes)
    RTP Payload Format for Enhanced Variable Rate Codecs (EVRC) and Selectable Mode Vocoders SMV (RFC 3558) (49787 bytes)
    RTP Payload Format for European Telecommunications Standards Institute (ETSI) European Standard ES 201 108 Distributed Speech Recognition Encoding (RFC 3557) (29692 bytes)
    Session Description Protocol (SDP) Bandwidth Modifiers for RTP Control Protocol (RTCP) Bandwidth (RFC 3556) (15310 bytes)
    MIME Type Registration of RTP Payload Formats (RFC 3555) (56618 bytes) updated by RFC 3625
    RTP Profile for Audio and Video Conferences with Minimal Control (RFC 3551) (106621 bytes) obsoletes RFC 1890
    RTP: A Transport Protocol for Real-Time Applications (RFC 3550) (259985 bytes) obsoletes RFC 1889
    Enhanced Compressed RTP (CRTP) for links with High Delay,Packet Loss and Reordering (RFC 3545) (48278 bytes)
    RTP Control Protocol Extended Reports (RTCP XR) (RFC 3611) (126736 bytes)
    RTP Payload Format for Transport of MPEG-4 Elementary Streams (RFC 3640) (102606 bytes)
    The Secure Real-time Transport Protocol (RFC 3711) (134270 bytes)
    RTP Payload Format for iLBC Speech (RFC 3952) (28655 bytes)
    Internet Low Bit Rate Codec (RFC 3951) (373442 bytes)
    RTP payload Format for H.264 Video (RFC 3984) (205093 bytes)
    RTP payload format for a 64 kbit/s transparent call (RFC 4040) (15363 bytes)
    RTP Payload Formats for European Telecommunications Standardsv Institute (ETSI) European Standard ES 202 050, ES 202 211, and ES 202 212 Distributed Speech Recognition Encoding (RFC 4060) (39654 bytes)
    Registration of the text/red MIME Sub-Type (RFC 4102) (11337 bytes)
    RTP Payload for Text Conversation (RFC 4103) (44246 bytes) obsoletes RFC 2793
    RTP Payload Format for Uncompressed Video (RFC 4175) (39431 bytes) updated by RFC 4421
    RTP Payload Format for AC-3 Audio (RFC 4184) (25202 bytes)
    Requirements for Header Compression over MPLS (RFC 4247) (25127 bytes)
    Tunneling Multiplexed Compressed RTP (TCRTP) (RFC 4170) (48990 bytes)
    RTP Payload Format for BroadVoice Speech Codecs (RFC 4298) (30099 bytes)
    Real-Time Transport Protocol (RTP) Payload Format for the Variable-Rate Multimode Wideband (VMR-WB) Audio Codec (RFC 4348) (73528 bytes) updated by RFC 4424
    Real-Time Transport Protocol (RTP) Payload for Text Conversation Interleaved in an Audio Stream (RFC 4351) (44405 bytes)
    RTP Payload Format for the Extended Adaptive Multi-Rate Wideband (AMR-WB+) Audio Codec (RFC 4352) (91291 bytes)
    RTP Payload Format for 3rd Generation Partnership Project (3GPP) Timed Text (RFC 4396) (155421 bytes)
    RTP Payload Format for Video Codec 1 (VC-1) (RFC 4425) (84335 bytes)
    RTP Payload Format for Uncompressed Video: Additional Colour Sampling Modes (RFC 4421) (8000 bytes) updates RFC 4175
    Real-Time Transport Protocol (RTP) Payload Format for the Variable-Rate Multimode Wideband (VMR-WB) Extension Audio Codec (RFC 4424) (16331 bytes) updates RFC 4348
    MIME Type Registration for RTP Payload Format for H.224 (RFC 4573) (13587 bytes)
    Extended RTP Profile for Real-time Transport Control Protocol (RTCP)-Based Feedback (RTP/AVPF) (RFC 4585) (117762 bytes)
    Framing Real-time Transport Protocol (RTP) and RTP Control Protocol (RTCP) Packets over Connection-Oriented Transport (RFC 4571) (18751 bytes)
    IETF Secretariat - Please send questions, comments, and/or suggestions to ietf-web@ietf.org.

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