reference - http://www.ehow.com/how_8740523_convert-multiple-videos-avidemux.html http://www.avidemux.org/admWiki/doku.php?id=using:command_line_usage
Create open a batch file aka videoconvert.bat and copy the following text example to use a template for a basic conversion. Note this example is for converting .mp4 video to .avi (Xvid+MP3 encoding) :
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set avidemux="C:\Program Files\Avidemux 2.5\avidemux2.exe"
set videocodec=Xvid
set audiocodec=MP3
for %%f in (*.mp4) do %avidemux% --video-codec %videocodec% --audio-codec %audiocodec% --force-alt-h264 --load "%%f" --save "%%f.avi" --quit
(The last two lines should be in one line of text).
Use Joblist
http://www.avidemux.org/admWiki/doku.php?id=using:joblist&s[]=avidemux&s[]=jobs
origin - http://www.pipiscrew.com/?p=3972 convert-multiple-videos-with-avidemux