Convert a live action video to gif from http://blog.pkh.me/p/21-high-quality-gif-with-ffmpeg.html

ffmpegtogif.sh

# Convert a live action video to gif
# Works best for videos with high color palettes like videos from your phone
#
# @param $1 - video file name like `video.mp4`
# @param @optional $2 - width size like `720`
#
# Example: ffmpegtogif video.mp4 720
# Requirements: ffmpeg. Can be downloaded via homebrew
#
# http://blog.pkh.me/p/21-high-quality-gif-with-ffmpeg.html
 
function ffmpegtogif() {
    if [ -n "$1" ]
        then
            if [ -n "$2" ]
                then
                    ffmpeg -v warning -i "$1" -vf "fps=24,scale=$2:-1:flags=lanczos,palettegen" -y "/tmp/palette.png"
                    ffmpeg -v warning -i "$1" -i "/tmp/palette.png" -lavfi "fps=24,scale=$2:-1:flags=lanczos [x]; [x][1:v] paletteuse" -y video.gif
            else
                echo "Use width as second parameter"
            fi
    else
        echo "Use video file as first parameter"
    fi
}

Source this in you .bash_profile for an easy shortcut to turn any live action video into a high-quality gif!

If you want to convert an animated video try out https://gist.github.com/imkevinxu/96e3cb1d7e308f867a0f