Dummy

Dummy means do nothing. It can be applied to lots of different areas, such any interface, container or codec. For input it means there's no input, for output the output is discarded.

Container

dummy

VLC can encode and decode this container. The module name to use at the command line is dummy, but you can also use raw, or es.

As a container format, it means that data is read or written without a container. For example, MP3 files do not have a container.