[AVT] IETF54 AVT meeting summary
Stephen Casner <casner@acm.org> Sat, 20 July 2002 13:04 UTC
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Date: Sat, 20 Jul 2002 06:02:03 -0700
From: Stephen Casner <casner@acm.org>
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Subject: [AVT] IETF54 AVT meeting summary
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Audio/Video Transport Working Group summary This meeting began with an update on document publication status, including a few issues identified for documents in the queue. One RFC was published since the last meeting (RFC 3267 on AMR payload format), three are in the RFC editor queue, and six are with the IESG. Of the latter, two are the RTP specification and A/V profile which have been "tentatively approved". An issue recently raised regards a conflict in the sample packing order for G.726 encoding between the profile and the ITU spec for AAL2 and a request to change the profile to be consistent with AAL2. This issue was discussed but not resolved in the meeting. The chairs are seeking Area Director guidance and additional input from parties that are using either of the packing orders. Four drafts in working group last call were not discussed. The payload format for Distributed Speech Recognition and the profile for RTCP-based feedback are both ready to go to the IESG after updates to address the last call comments. The two unequal protection drafts (ULP and UXP) have also completed last call requirements. However, Steve Casner proposed in the meeting that the ULP draft, which extends RFC 2733, be changed instead to obsolete 2733 and correct what may have been a bad design decision regarding the RTP header X and P bits. The group seemed to be in general agreement with this idea. The bulk of the meeting was dedicated to updates on payload formats already in development: for audio, MIDI, AC-3, and iLBC, and for video, JPEG 2000, JVT, SMPTE 292M and MPEG-4 (both mpeg4-simple and FlexMux). Of these, mpeg4-simple has, as of the meeting time, completed its WG last call period, but there were a few last call comments to be addressed with another revision that will be submitted for IESG Last Call. Most of the remaining drafts are nearing completion; two separate demos showing transmission using the AC-3 and JPEG 2000 payload formats were conducted at the end of the session. Two new payload formats were presented. The first is a generic format to add interleaving to other audio formats in a manner analogous to RFC 2198 for redundancy. The second is a "native" packetization for uncompressed video to complement the circuit emulation of the SMPTE 292M payload format. Both generated interest and suggestions for changes from the meeting participants. A third new draft is a revision of RFC 2833 (tones payload format). This is intended to be a quick update cycle to correct problems that have been discovered and prepare for advancement to Draft Standard, which will require interoperability verification. A volunteer is sought to track this. In addition to the payload format drafts, there were several drafts related to RTCP. During the course of the IETF meeting, the authors of the RTCP reporting extensions and VoIP metrics drafts produced the merged draft that was requested at the last IETF meeting. It was suggested during the meeting that this draft go to Proposed Standard rather than Experimental as we had decided before. Perhaps the most significant progress at this meeting resulted from side discussions among the authors of the two alternative proposals for RTP retransmission based on RTCP feedback. The SN-multiplexing scheme of the "selret" proposal will be abandoned in favor of SSRC multiplexing so long as no problems with the latter are found. Separately, the SEL format for communicating packet priority will be evaluated compared to full loss reporting. A work plan leading to WG last call in December was outlined. The last topic was RTCP extensions for Single-Source Multicast sessions. In previous discussions of this draft, we've established the need to address the security issues it introduces. A good analysis of the security threats and an evaluation of the existing solutions has been written as a separate document to work toward the finished solution. Action Items We took two "hums" during the meeting which need confirmation on the mailing list. They were to accept the payload formats for uncompressed video (draft-gharai-avt-uncomp-video-00.txt) and for JVT video (draft-wenger-avt-rtp-jvt-01.txt) as working group tasks. We solicit confirmations or objections on these actions -- we want to hear both "yeas" and "nays". _______________________________________________ Audio/Video Transport Working Group avt@ietf.org https://www1.ietf.org/mailman/listinfo/avt
- [AVT] IETF54 AVT meeting summary Stephen Casner
- [AVT] uncomp-video hum [was: IETF54 AVT meeting s… Chuck Harrison
- Re: [AVT] uncomp-video hum [was: IETF54 AVT meeti… Ladan Gharai