Quick start from GraphEdit

To try the encoder mode instead

Insert the "Datastead Encoder" filter rather than the "Datastead Multipurpose Encoder", connect the same pins, then right-click it to open its encoder settings page. No command line is involved. See Encoder mode.

The steps below use the FFmpeg command-line mode:

run GraphEdit -> Graph -> Insert Filters -> DirectShow Filters,
locate the "Datastead Multipurpose Encoder" filter, double-click on it to insert it,
insert the video source filter (e.g. a Webcam) and/or the audio source filter (e.g. a microphone),
connect the video output pin (if any) to the Multipurpose video input pin,
connect the audio output pin (if any) to the Multipurpose audio input pin,
right-click on the "Datastead Multipurpose Encoder" filter, and enter the command line, optionally preceded by the reserved keywords,
run the graph.

Examples of a very minimalistic command line that can be tested "out of the box":

with console, for debugging purpose:

SHOWCONSOLE ffmpegLGPL.exe -i %PIPE% myclip.webm

or not visible, like a normal DirectShow sink filter:

ffmpegLGPL.exe -i %PIPE% myclip.webm

Screenshots

GraphEdit:

The Multipurpose Encoder in GraphEdit

GraphEdit with the debug console:

The Multipurpose Encoder in GraphEdit with the debug console visible