[Speex-dev] Bitrate Question

Jim Crichton jim.crichton at comcast.net
Mon Sep 15 09:57:38 PDT 2008

Read the manual:  http://www.speex.org/docs/manual/speex-manual.pdf

Table 9.2 has the bitrates for narrowband, 10.2 has the bitrates for 

The next step after 8000 is 11000, so any "-- bitrate" value between 8000 
and 10999 will give you the 8kbps mode.

- Jim

----- Original Message ----- 
From: "Ilya" <ilch1 at netzero.net>
To: <speex-dev at xiph.org>
Sent: Monday, September 15, 2008 9:11 AM
Subject: [Speex-dev] Bitrate Question

> Hello developers,
> I have a question about supported bitrates for SPEEX.  Regardless of 
> whether I specify a 10kbps or a 8kbps bitrate, the encoded .spx file is 
> the same size and have the same PESQ value.  This makes me wonder if SPEEX 
> supports arbitrary bitrates, or only a certain set.
> A few more details about my configuration:
> I am using SPEEX encoder version 1.1.12
> I am encoding a narrowband (8KHz) wav file
> The exact commands I issue are:
> speexenc --bitrate 8000 file.wav file8.spx
> speexenc --bitrate 10000 file.wav file10.spx
> Both of the encoded files, file8.spx and file10.spx are the same size.
> Please advice on what I am doing incorrectly.
> Thank you,
> Ilya
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> Speex-dev at xiph.org
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