Add current frame number overlay to all videos in current directory

addframes.bash

# $1 = target directory
function addframes() {
    for filename in *.mp4; do
        ffmpeg -i "$filename" -vf "drawtext=fontfile=Arial.ttf: text=%{n}: x=(w-tw)/2: y=h-(2*lh): fontcolor=white: box=1: boxcolor=0x00000099: fontsize=32" -y "$1/"$filename"
    done
}