Screen recording using a dockerized ffmpeg

ffmpeg.sh

#!/bin/bash

docker run -it --rm --privileged --net host \
    -v /tmp/.X11-unix:/tmp/.X11-unix \
    -v $PWD:$HOME/workspace \
    -v $HOME/.Xauthority:$HOME/.Xauthority \
    -e HOME=$HOME \
    -e DISPLAY=$DISPLAY \
    --entrypoint /usr/sbin/ffmpeg \
    kfei/ffmpeg $*

# Now you can alias ffmpeg to this script

gistfile1.sh

#!/bin/sh
#
# Example of screen recording

OUTFILE="$HOME/workspace/output.mp4"
ffmpeg -f x11grab -r 15 -s 1920x1080 -i :0 -vcodec h264 -crf 30 -y $OUTFILE

gistfile2.sh

#!/bin/sh
#
# Example of screen recording (to a specific window)
# Reference: http://www.reddit.com/r/linux/comments/1nioax/til_that_you_can_record_your_desktop_with_vlc/

INFO=$(xwininfo -frame)

WIN_GEO=$(echo $INFO | grep -oEe 'geometry [0-9]+x[0-9]+' | grep -oEe '[0-9]+x[0-9]+')
WIN_XY=$(echo $INFO | grep -oEe 'Corners:\s+\+[0-9]+\+[0-9]+' | grep -oEe '[0-9]+\+[0-9]+' | sed -e 's/\+/,/' )

ffmpeg -f x11grab -r 15 -s $WIN_GEO -i :0.0+$WIN_XY -vcodec h264 -preset ultrafast -y $OUTFILE