avidemux command line problem

[cucujoidea]

Hello,

when I call

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avidemux --audio-stereo2mono

in a Linux terminal, i get the error :

Unknown command :--audio-stereo2mono

this command is listet here:

http://www.avidemux.org/admWiki/doku.php?id=using:command_line_usage

how can I get this working?

Regards

EDIT:
OK- got something useful after a while:

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avidemux2_cli --load input.AVI --audio-resample 22050 --audio-stereo2mono --audio-codec MP3 --video-codec x264 --save output.mp4 --quit


in a script:

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#!/bin/bash
VAR="files.txt"
ls *.AVI | sort > $VAR # Collect the files in the current directory
cat $VAR | while read line; do  # Loop read the filenames from the file
  INPUT=$(echo ${line}) # Grab the nxt new filename
  OUTPUT=${INPUT%.AVI} # Remove shortest match of characters between the .AVI at end of string
  OUTPUT+=".mp4" # Append new extension
  # some stuff
  # avidemux2 --force-alt-h264 --load "$INPUT" --save "$OUTPUT" --output-format AVI --quit
  #
  avidemux2_cli --load "$INPUT" --audio-resample 22050 --audio-stereo2mono --audio-codec MP3 --video-codec x264 --save "$OUTPUT" --quit
done
rm $VAR # Remove the text file with the file names