ffgolapse

#!/usr/bin/env bash

# ffgolapse: Convert a sequence of GOPRO folders (containing images) into a timelapse

set -eo pipefail

function help {
  echo "Usage: ffgolapse <output>"
  exit
}

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

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

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

# Note the glob: if you're not in a directory containing GoPro directories, you're SOL.
ffmpeg -r 10 -pattern_type glob -i '*GOPRO/*.JPG' "${1}"