ffwatermark

#!/usr/bin/env bash

# ffwatermark: Place a watermark image in the center of a video.

set -eo pipefail

function help {
  echo "Usage: ffwatermark <input> <watermark> <output>"
  exit
}

function installed {
    cmd=$(command -v "${1}")

    [[ -n "${cmd}" ]] && [[ -f "${cmd}" ]]
    return ${?}
}

[[ $# -eq 3 && -f $1 && -f $2 && ! -f $3 ]] || help
installed ffmpeg || { >&2 echo "Missing ffmpeg."; exit 1; }

# https://stackoverflow.com/a/10920872
ffmpeg -i "${1}" -i "${2}" \
    -filter_complex "overlay=(main_w-overlay_w)/2:(main_h-overlay_h)/2" \
    -codec:a copy "${3}"