ffmpeg-stabilize

#!/bin/bash
set -euo pipefail

run() {
    echo >&2 "+ $*"
    "$@"
}

cleanup() {
    echo >&2 ERROR
    if [ -n "${vectors-}" ]; then
        rm -fv "$vectors"
    fi
}

usage() {
    cat >&2 <<EOM
usage: $(basename "$0") INPUT OUTPUT

Stabilize given input video using ffmpeg and vid.stab.
EOM
}

colorecho() {
    # shellcheck disable=SC2230
    if which colorecho >/dev/null 2>&1; then
        command colorecho "$@"
    else
        shift
        echo "$@"
    fi
}

if [ $# -ne 2 ]; then
    usage
    exit 1
fi

input="$1"
output="$2"

TMPDIR="${TMPDIR-/tmp}"

vectors="$(mktemp "$TMPDIR/ffmpeg-stabilize.XXXXXXXX.trf")"
trap cleanup EXIT

echo >&2
colorecho >&2 cyan "Generating transform vectors..."
echo >&2

run ffmpeg -i "$input" \
    -vf "vidstabdetect=stepsize=32:shakiness=10:accuracy=10:result=$vectors" \
    -f null -

echo >&2
colorecho >&2 cyan "Generating output video..."
echo >&2

run ffmpeg -i "$input" \
    -vf "vidstabtransform=input=$vectors:zoom=0:smoothing=10,unsharp=5:5:0.8:3:3:0.4" \
    -vcodec libx264 -tune film -preset slow -acodec copy "$output"

rm -fv "$vectors"
trap - EXIT
echo >&2
colorecho >&2 cyan "All done!"