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This article is deprecated and not valid for current versions of the Mumble client or the Mumble server

How to convert a sound file to speex

Mumble now supports playing triggered events using a speex sound file. This guide will show you how to convert almost any non-DRM sound file to a speex file that you can use in Mumble.


First you will need a sound file. Find the file you want to convert and remember where it is located. For the purposes of this guide all sound files (for the Windows based instructions) will be called "sound.<extension>".

Now install MediaCoder: http://mediacoder.sourceforge.net/download.htm (Please note that if you already have a wav file, you can use it. It must be a 16 Khz, Mono WAV or PCM file however.) You can also use your encoder of choice to convert it to 16 Khz mono if you wish. MediaCoder is used here as an example.

Once MediaCoder is installed, start it and drag your sound file into the top left box that has the "Name" field at the top of it. Now click the "Audio" tab near the bottom of the MediaCoder window. For the Encoder select "Waveform", for Resample select "16000 Hz" and for Channel select "Mono (Left)". Output should be set to "Waveform file". Now press F5 and the encoding process should begin. Once it is done you should have a wav file in the same location as the input file. Please note, in future versions of Mumble, different sound files will be used so make sure to keep your original sound files.

It is now time to install the Speex convertor. Download and unzip this http://downloads.xiph.org/releases/speex/speex-1.2beta3-win32.zip to C:. Rename the folder speex-1.2beta3-win32 to just speex. There have been issues running this version of speexenc with Windows Vista for certain people. If speexenc crashes when you try to encode, please post on the forums to let us know.

Windows Commands

Start your command prompt (press the Windows key, hold it down, then press the R key, type cmd and press enter). Type

cd \speex\bin

and press enter. Now in Windows Explorer find your transcoded wav file, and put it in C:\speex\bin.

Now copy this command, and in the command prompt, right click and select "Paste".

speexenc.exe --quality 10 --comp 10 --nframes 10 sound.wav sound.spx

Press enter and it should encode the wav file into a speex file.

Take the speex file from the C:\speex\bin folder using Windows Explorer, and put it in C:\Program Files\Mumble\spx (this step is not necessary but it makes managing your sound files a bit easier).

Linux Commands


sox [1]


Convert your wave File to 16 kHz (wideband)

sox record.wav record-wideband.wav rate 16000

Convert your wave File to Speex ogg

speexenc --quality 10 --comp 10 --nframes 10 record-wideband.wav record.spx

Enabling the Sound File

In Mumble, go to Configure -> Settings -> Messages and select a message you would like the sound file to play when the message triggers. Once selected, click the radio box for "Soundfile" then click Browse. You should see the spx folder you created. Open this, select your speex file, and click Open. You can also test the file here by clicking it once. Doubleclick it to change the file.