IETF Logo Mail Archive

Re: [codec] Discussion around ITU LS

Anisse Taleb <Anisse.Taleb@huawei.com> Thu, 08 September 2011 10:44 UTC

Return-Path: <Anisse.Taleb@huawei.com>
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 3F15521F8B00 for <codec@ietfa.amsl.com>; Thu, 8 Sep 2011 03:44:28 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -5.899
X-Spam-Level:
X-Spam-Status: No, score=-5.899 tagged_above=-999 required=5 tests=[AWL=0.701, BAYES_00=-2.599, RCVD_IN_DNSWL_MED=-4]
Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id JZwG1uXDLDi3 for <codec@ietfa.amsl.com>; Thu, 8 Sep 2011 03:44:27 -0700 (PDT)
Received: from lhrga04-in.huawei.com (lhrga04-in.huawei.com [195.33.106.149]) by ietfa.amsl.com (Postfix) with ESMTP id AE09D21F8AF9 for <codec@ietf.org>; Thu, 8 Sep 2011 03:44:27 -0700 (PDT)
Received: from huawei.com (localhost [127.0.0.1]) by lhrga04-in.huawei.com (iPlanet Messaging Server 5.2 HotFix 2.14 (built Aug 8 2006)) with ESMTP id <0LR700E4A9JYDU@lhrga04-in.huawei.com> for codec@ietf.org; Thu, 08 Sep 2011 11:38:22 +0100 (BST)
Received: from LHREML201-EDG.china.huawei.com ([172.18.7.118]) by lhrga04-in.huawei.com (iPlanet Messaging Server 5.2 HotFix 2.14 (built Aug 8 2006)) with ESMTP id <0LR700HUX9JYAK@lhrga04-in.huawei.com> for codec@ietf.org; Thu, 08 Sep 2011 11:38:22 +0100 (BST)
Received: from LHREML402-HUB.china.huawei.com (10.201.5.31) by LHREML201-EDG.china.huawei.com (172.18.7.188) with Microsoft SMTP Server (TLS) id 14.1.270.1; Thu, 08 Sep 2011 11:38:12 +0100
Received: from LHREML503-MBX.china.huawei.com ([fe80::f93f:958b:5b06:4f36]) by LHREML402-HUB.china.huawei.com ([::1]) with mapi id 14.01.0270.001; Thu, 08 Sep 2011 11:38:17 +0100
Date: Thu, 08 Sep 2011 10:38:16 +0000
From: Anisse Taleb <Anisse.Taleb@huawei.com>
In-reply-to: <4E66F111.9070008@mozilla.com>
X-Originating-IP: [172.18.7.193]
To: Jean-Marc Valin <jmvalin@mozilla.com>, Cullen Jennings <fluffy@cisco.com>
Message-id: <6A58A83F7040374B9FB4EEEDBD835512A3FBAA@LHREML503-MBX.china.huawei.com>
MIME-version: 1.0
Content-type: text/plain; charset="us-ascii"
Content-language: en-GB
Content-transfer-encoding: 7bit
Accept-Language: en-GB, en-US
Thread-topic: [codec] Discussion around ITU LS
Thread-index: AQHMbNdFqNL2VxoWr0KOLjBFjn6nQ5VBQIaAgAIGLdU=
X-MS-Has-Attach:
X-MS-TNEF-Correlator:
References: <35921B63-3FBC-411D-B587-4AB81F218E57@cisco.com> <4E66F111.9070008@mozilla.com>
Cc: Jonathan Rosenberg <jonathan.rosenberg@skype.net>, "codec@ietf.org" <codec@ietf.org>
Subject: Re: [codec] Discussion around ITU LS
X-BeenThere: codec@ietf.org
X-Mailman-Version: 2.1.12
Precedence: list
List-Id: Codec WG <codec.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/codec>, <mailto:codec-request@ietf.org?subject=unsubscribe>
List-Archive: <http://www.ietf.org/mail-archive/web/codec>
List-Post: <mailto:codec@ietf.org>
List-Help: <mailto:codec-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/codec>, <mailto:codec-request@ietf.org?subject=subscribe>
X-List-Received-Date: Thu, 08 Sep 2011 10:44:28 -0000

Dear Jean Marc,

>> Does the WG consider  time shortening / stretching functionality they
>> would want to include in opus as a technique to use for PLC?

>While time stretching/shortening is something that can be useful, I
>don't think it's really necessary for a codec *specification*. In fact
>even the PLC is provided only as an example.


Quoting the requirements document RFC 6366:
"  It is desirable for the reference implementation to provide a time stretching/shortening
   implementation, although it should not be normative."

While I agree that this is something that should be non-normative, such an integrated implementation 
would be an important feature for any codec deployed on the internet and really differentiate Opus wrt. "codecs" which are considered unsuitable for the internet. 

Kind regards,
/Anisse

v2.23.0 | Report a Bug | By Email