I have the below for cases when I have to make a quick screencast. It needs ffmpeg and I am not sure how well the yt flag works as I don't really use Youtube any longer. Anyway.. first I do 'ffsc sc' and if I want that video to be smaller I do 'ffsc yt <path_to_file>'.

## Make screencast or convert to yt

ffsc () {

vid_name="$HOME/Videos/Screencasts/screencast_$(date +'%y%m%d-%H%M%S')"

        case $1 in
                sc) ffmpeg -f x11grab -s 1920x1080 -i $DISPLAY -r 30 -f alsa -i default -preset ultrafast \
                    -c:v ffvhuff -c:a flac ${vid_name}.mkv
                    printf "${vid_name}.mkv" | xsel -i

                    echo
                    echo "- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -"
                    echo "Output file name: ${vid_name}.mkv"
                    echo "- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -"
                    echo

                    [ -e /tmp/ffsc.tmp ] && { rm /tmp/ffsc.tmp }
                    printf "${vid_name}.mkv" > /tmp/ffsc.tmp
                ;;
                yt) ffmpeg -i $2 -c:v libx264 -crf 18 -preset slow -pix_fmt rgb24 -c:a copy ${2/scr/yt_scr}
                    yt_name=$(cat /tmp/ffsc.tmp)
                    printf "${yt_name/scr/yt_scr}" | xsel -i

                    echo
                    echo "- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -"
                    echo "Output file name: ${yt_name/scr/yt_scr}"
                    echo "- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -"
                    echo
                ;;

                mini) ffmpeg -i $2 -strict -2 -s 1680x1050  -r 60 -c:v libx264 -b:v 164 -crf 22 -preset slow \
                      -pix_fmt yuv420p -c:a copy -an ${2/scr/mini_scr}
                      mini_name=${2/scr/mini_scr}
                      ffmpeg -i ${mini_name} -filter:v "setpts=0.5*PTS" -an ${mini_name/.mkv/.mp4}
                      rm ${mini_name}
                    printf "${mini_name/.mkv/.mp4}" | xsel -i

                    echo
                    echo "- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -"
                    echo "Output file name: ${mini_name/.mkv/.mp4}"
                    echo "- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -"
                    echo
                ;;
        esac

}

And another nice one I didn't see here..

# Python as a calculator

pc() { python -c "print($*)"; }