Streaming desktop to webcam with avconv

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http://askubuntu.com – I'm trying to use avconv to capture my desktop and stream it on my webcam. Unfortunately I do not know what output format I should use to do this. The following is what I currently have. avconv -f x11grab -s 1920x1080 -r 30 -i :0.0+0,0 Can someone point me in the right direction? Thanks (HowTos)