[AVT] Vorbis RTP issues list for Vienna
philkerr@elec.gla.ac.uk Mon, 07 July 2003 19:25 UTC
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Subject: [AVT] Vorbis RTP issues list for Vienna
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Dear all, Last month (11th June) an -02 update to draft-kerr-avt-vorbis-rtp was announced on the AVT list and a slot in Vienna has been booked for discussion. The draft details the RTP delivery of Vorbis audio, SDP values and delivery of the decoders static probability model, 'codebooks'. Examples of Vorbis frame packing and fragmented packet handling are also covered. Open issues: Congestion control. Under development is a mechanism for dynamic bitrate reduction called 'bitrate peeling'. When this feature becomes available it will impact on how congestion is dealt with and a mechanism allowing its use within a multicast environment needs to be explored. Codebook delivery. There are two mechanisms outlined for the delivery of the codebooks, SDP and RTCP. The codebooks may change mid-stream (at the boundary between two tracks) as well as being static for the session lifetime. As the codebooks are needed for the successful decoding of the Vorbis stream a reliable mechanism to handle their delivery of mid-session codebook changes should be investigated (TCP over RTP?) in preference to using RTCP messages. Path MTU. There is a mechanism for splitting large Vorbis frames across multiple RTP packets but a reliable mechanism for path-MTU discovery needs to be outlined to prevent packet fragmentation not dealt with by the above. I've also requested WG status for the I-D. Comments and feedback welcomed. Regards Phil ------------------------------------------------- This mail sent through IMP: http://horde.org/imp/ _______________________________________________ Audio/Video Transport Working Group avt@ietf.org https://www1.ietf.org/mailman/listinfo/avt
- [AVT] Vorbis RTP issues list for Vienna philkerr
- Re: [AVT] Vorbis RTP issues list for Vienna Magnus Westerlund
- Re: [AVT] Vorbis RTP issues list for Vienna John Lazzaro
- Re: [AVT] Vorbis RTP issues list for Vienna philkerr
- Re: [AVT] Vorbis RTP issues list for Vienna Magnus Westerlund
- Re: [AVT] Vorbis RTP issues list for Vienna John Lazzaro
- Re: [AVT] Vorbis RTP issues list for Vienna Ross Finlayson
- Re: [AVT] Vorbis RTP issues list for Vienna Aaron Colwell
- Re: [AVT] Vorbis RTP issues list for Vienna philkerr
- Re: [AVT] Vorbis RTP issues list for Vienna philkerr
- Re: [AVT] Vorbis RTP issues list for Vienna Aaron Colwell
- Re: [AVT] Vorbis RTP issues list for Vienna Ross Finlayson
- Re: [AVT] Vorbis RTP issues list for Vienna Aaron Colwell
- Re: [AVT] Vorbis RTP issues list for Vienna Mark Baugher
- RE: [AVT] Vorbis RTP issues list for Vienna Rosen, Brian
- RE: [AVT] Vorbis RTP issues list for Vienna Michael A. Ramalho
- RE: [AVT] Vorbis RTP issues list for Vienna Mark Baugher