Convert a video to black and white using avidemux on Ubuntu

Convert a video to black and white using avidemux on Ubuntu I have a small video that I would like to convert to black and white. I'm on Ubuntu, and I've avidemux installed. I will be OK if it can be done with some other software if not avidemux; basically, using some open source or free software, not a software for which I've to pay.
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Guest [Entry]

"According to this article, MEncoder that comes with the MPlayer package is cabable of doing this.

sudo apt-get install mplayer libxine-extracodecs
mencoder color-video.avi -o black-white-video.avi -vf hue=0:0 -oac copy -ovc lavc

The manual and encoder guide to MEncoder."