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CRC-DabMux is the free open source DAB Multiplexer developed by Communication Research Center (CRC) from Canada. It is a command line tool.

CRC have stopped releasing new versions, and the development now continues on GitHub with releases available on http://mpb.li

This page describes how to compile and use crc-dabmux.


More information

Description can be found on http://mmbtools.crc.ca/content/view/39/65/

The last version published by CRC is version, on which the latest developments are based.

Build information for CRC-DABMUX-


You will need boost at least version 1.42. The one from your distribution is probably fine, and if you have installed GNURadio or UHD, you will already have it.

If you want to use the zeromq inputs or outputs, you need a recent (4.0.3 is best) version of ZeroMQ. It is probably preferred to install it from source:

wget http://download.zeromq.org/zeromq-4.0.3.tar.gz
cd zeromq-4.0.3
sudo make install

This will install it into /usr/local

Then, get the zmq C++ bindings:

wget https://raw2.github.com/zeromq/cppzmq/master/zmq.hpp
sudo cp zmq.hpp /usr/local/include

(alternatively, you can git clone https://github.com/zeromq/cppzmq.git)

CRC-DabMux also depends on libfec from Phil Karn. On 64-bit machines, the original libfec doesn't compile (" fec.h:267: Error: bad register name `%dil' "). A patched version that compiles on x86_64 (and even on ARM) is available on GitHub (.zip)


Once the prerequisites are installed, do

./configure --with-debug-malloc=no --disable-debug --enable-input-zeromq --enable-output-zeromq
sudo make install

or, if you don't have zeromq:

./configure --with-debug-malloc=no --disable-debug
sudo make install

then you can execute, as a test

crc-dabmux -h

When building, be careful to disable debugging, otherwise there will be lot of wasted CPU usage.

Compilation from the git repository

If you cloned the git repository, you might need to call


to re-generate the autotools scripts and generate the ./configure script

After that, it's the same as above


There are two ways to use CRC-DabMux: with command line arguments or with a configuration file.

Command line interface

There are quite many arguments and options, and the best is to read the manpage (man crc-dabmux) first, and then to look at some examples (e.g. mux-throttled.sh)

Configuration file

The full configuration can also be specified in a configuration file.

The example configuration file that is included in doc (example.mux) contains an example with a multiplex consisting of two services. The example file is commented, and is a good example to build your own.

To run crc-dabmux with a configuration file, run

crc-dabmux -e my_config.mux

Additional information

Patch to increase page size

Some glitches have been noticed on some machines. They are due to underruns in the FIFO. This patch increases the buffer sizes in the mux. wrning, this patch will also increase the delay. To apply it use, the patch command. (for CRC-DabMux <=

--- src/dabInputFifo.cpp.org	2011-09-27 10:08:35.202323204 -0400
+++ src/dabInputFifo.cpp	2011-09-27 10:13:57.638315966 -0400
@@ -169,11 +169,12 @@
     if (data->buffer != NULL) {
         delete data->buffer;
-    if (size == 0) {
-        size = 1024;
-    }
-    data->buffer = new unsigned char[size * 16];
     data->maxSize = size * 16;
+    int minSize = 2*getpagesize();
+    while (data->maxSize < minSize) {
+        data->maxSize += size;
+    }
+    data->buffer = new unsigned char[data->maxSize];
 #ifdef _WIN32
     ReleaseSemaphore(data->semBuffer, 1, NULL);

See the manpage for more info:

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