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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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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.

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Thanks you! For some reason, I couldn't install "libxine-extracodecs". So, when I installed just mplayer, I didn't get the mencoder tool. I installed mencoder separately, and executed the second command above. Worked like a charm! – artknish Aug 18 '09 at 15:21
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