IETF Logo Mail Archive

Re: [rtcweb] On video codec for rtcweb

Jean-Marc Valin <jmvalin@mozilla.com> Sun, 25 March 2012 00:34 UTC

Return-Path: <jmvalin@mozilla.com>
X-Original-To: rtcweb@ietfa.amsl.com
Delivered-To: rtcweb@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 7C2FD21F84EC for <rtcweb@ietfa.amsl.com>; Sat, 24 Mar 2012 17:34:37 -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 ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 6L-ee4wLD3zw for <rtcweb@ietfa.amsl.com>; Sat, 24 Mar 2012 17:34:37 -0700 (PDT)
Received: from dm-mail03.mozilla.org (dm-mail03.mozilla.org [63.245.208.213]) by ietfa.amsl.com (Postfix) with ESMTP id 6824721F84EA for <rtcweb@ietf.org>; Sat, 24 Mar 2012 17:34:35 -0700 (PDT)
Received: from [172.22.10.239] (unknown [207.164.135.98]) (Authenticated sender: jvalin@mozilla.com) by dm-mail03.mozilla.org (Postfix) with ESMTP id 9D9B34AED83; Sat, 24 Mar 2012 17:34:34 -0700 (PDT)
Message-ID: <4F6E6818.1010206@mozilla.com>
Date: Sat, 24 Mar 2012 20:34:32 -0400
From: Jean-Marc Valin <jmvalin@mozilla.com>
User-Agent: Mozilla/5.0 (X11; Linux i686 on x86_64; rv:11.0) Gecko/20120312 Thunderbird/11.0
MIME-Version: 1.0
To: Roman Shpount <roman@telurix.com>
References: <4F6C5A5E.6050100@ericsson.com> <4F6C6138.6010908@mozilla.com> <E44893DD4E290745BB608EB23FDDB76219E813@008-AM1MPN1-041.mgdnok.nokia.com> <E36D1A4AE0B6AA4091F1728D584A6AD215EC3936@ORSMSX104.amr.corp.intel.com> <7D8EC27B-2446-4992-B5F5-5CC7A17D2BCE@phonefromhere.com> <CAD5OKxvQekanZZRWTOz19rMTrPRAPc8TbaSruJsvdnJB5XN_FA@mail.gmail.com>
In-Reply-To: <CAD5OKxvQekanZZRWTOz19rMTrPRAPc8TbaSruJsvdnJB5XN_FA@mail.gmail.com>
Content-Type: text/plain; charset="ISO-8859-1"
Content-Transfer-Encoding: 7bit
Cc: "rtcweb@ietf.org" <rtcweb@ietf.org>
Subject: Re: [rtcweb] On video codec for rtcweb
X-BeenThere: rtcweb@ietf.org
X-Mailman-Version: 2.1.12
Precedence: list
List-Id: Real-Time Communication in WEB-browsers working group list <rtcweb.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/rtcweb>, <mailto:rtcweb-request@ietf.org?subject=unsubscribe>
List-Archive: <http://www.ietf.org/mail-archive/web/rtcweb>
List-Post: <mailto:rtcweb@ietf.org>
List-Help: <mailto:rtcweb-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/rtcweb>, <mailto:rtcweb-request@ietf.org?subject=subscribe>
X-List-Received-Date: Sun, 25 Mar 2012 00:34:37 -0000

On 24/03/12 07:56 PM, Roman Shpount wrote:
> Not that I have anything against OPUS (except that it is not a standard
> yet), but G711 works just fine for calls within local LAN or over a
> wireline network. If you have the bandwidth, you can run it with 16 or
> 32 KHz sampling rate and it will sound considerably better then any
> compressed codec. 

Have you ever listened to G.711 at 16 kHz? Certainly not "better then
any compressed codec". In fact, the white quantization noise will
usually be louder than the higher frequencies of the signal. And 32 kHz
will just be even worse.

	Jean-Marc

v2.23.0 | Report a Bug | By Email