Return-Path: X-Original-To: codec@ietfa.amsl.com Delivered-To: codec@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 2A75D11E80E3 for ; Tue, 5 Jul 2011 07:04:54 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -6.599 X-Spam-Level: X-Spam-Status: No, score=-6.599 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, RCVD_IN_DNSWL_MED=-4] Received: from mail.ietf.org ([64.170.98.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id s1CRuB+xQRal for ; Tue, 5 Jul 2011 07:04:53 -0700 (PDT) Received: from exprod7og114.obsmtp.com (exprod7og114.obsmtp.com [64.18.2.215]) by ietfa.amsl.com (Postfix) with ESMTP id 3CCA411E80E1 for ; Tue, 5 Jul 2011 07:04:53 -0700 (PDT) Received: from P-EMHUB01-HQ.jnpr.net ([66.129.224.36]) (using TLSv1) by exprod7ob114.postini.com ([64.18.6.12]) with SMTP ID DSNKThMaArEaf2O/38yJpXrVTBzqr23NwcSL@postini.com; Tue, 05 Jul 2011 07:04:53 PDT Received: from EMBX01-HQ.jnpr.net ([fe80::c821:7c81:f21f:8bc7]) by P-EMHUB01-HQ.jnpr.net ([fe80::fc92:eb1:759:2c72%11]) with mapi; Tue, 5 Jul 2011 07:01:59 -0700 From: Gregory Maxwell To: "julian.spittka@skype.net" , "codec@ietf.org" Date: Tue, 5 Jul 2011 07:01:59 -0700 Thread-Topic: [codec] RTP Payload Format and File Storage Format for Opus Speech and Audio Codec - draft-spittka-payload-rtp-opus-00 Thread-Index: Acw6pw9jgR5RV21fTeKHP+yx4tKudAAAAQjAABzEVG0= Message-ID: References: <00f501cc3aa7$551264c0$ff372e40$@spittka@skype.net> In-Reply-To: <00f501cc3aa7$551264c0$ff372e40$@spittka@skype.net> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: acceptlanguage: en-US Content-Type: text/plain; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Subject: Re: [codec] RTP Payload Format and File Storage Format for Opus Speech and Audio Codec - draft-spittka-payload-rtp-opus-00 X-BeenThere: codec@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Codec WG List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 05 Jul 2011 14:04:54 -0000 Julian Spittka [julian.spittka@skype.net] wrote: > Please find a first draft "draft-spittka-payload-rtp-opus-00" for the "RT= P > Payload Format and File Storage Format for Opus Speech and Audio Codec" > uploaded at > https://datatracker.ietf.org/doc/draft-spittka-payload-rtp-opus/. > Any feedback, questions, or comments are highly welcome. Regarding the file format part=97 Ah=97 Why does the world need another multimedia container format? Much less one which is unseekable (without doing a prior read of the whole = file), unable to recover from damage (no capture sequence, no corruption detection= ), and high overhead (minimum overhead at 64kbit/sec of 2.5%, without dtx). I suggest dropping the file format part=97 either completely or replacing i= t with stubs with recommendations/parameters for encapsulating it in other more wi= dely implemented container formats (e.g. MKV, Ogg (RFC3533), RIFF/AVI) People are going to do this in any case because of the aforementioned limitations, so adding another one will just promote incompatibility if it is used at all.