Stabilise shaky video with ffmpeg and vid.stab

stabilize.sh

alias stabilize=stabilize

function stabilize() {
    type ffmpeg >/dev/null 2>&1 || { echo >&2 "ffmpeg is required but it's not installed."; return 1; }
    video="${1}"
    filename="${1%.*}"
    extension="${1##*.}"
    output="${filename}-stabilized.${extension}"
    # calculate transformation vectors
    ffmpeg -nostdin -hide_banner -i "${video}" -vf vidstabdetect=stepsize=6:shakiness=8:accuracy=15:result=transform_vectors.trf -f null -
    # stabilise video using transformation vectors from previous step
    ffmpeg -nostdin -hide_banner -i "${video}" -vf vidstabtransform=input=transform_vectors.trf:zoom=1:smoothing=30,unsharp=5:5:0.8:3:3:0.4 -vcodec libx264 -preset slow -tune film -crf 18 -acodec copy "${output}"
    rm -fr transform_vectors.trf
}