The mplex multiplexes MPEG audio and video streams into system layers.

From INSTRUCT (in the mplex source):
>
> Please note that I do not have a comprehensive instruction manual for this
> release. I suggest you try the program out with some default values and
> learn something more about ISO/IEC 11172-1 (aka MPEG1/Systems).
>
>
> Christoph.
> moar@heaven.zfe.siemens.de
> +---------------------------------------+--------------------------------+
> | http://www.informatik.tu-muenchen.de/ |                 Christoph Moar |
> | cgi-bin/nph-gateway/hphalle6/~moar/   |                Kaulbachstr.29a |
> | index.html                            |                   80539 Munich |
> | email:moar@informatik.tu-muenchen.de  |   voice: ++49 - 89 -  23862874 |
> +---------------------------------------+--------------------------------+