capture screen as video on Linux
avconv -minrate 1000 -f x11grab -s 1366x768 -r 25 -i :0.0 output.mkv
ffmpeg -f x11grab -s 1024x768 -r 25 -i :0.0 -sameq output.mkv
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avconv -minrate 1000 -f x11grab -s 1366x768 -r 25 -i :0.0 output.mkv
ffmpeg -f x11grab -s 1024x768 -r 25 -i :0.0 -sameq output.mkv