gif2mp4

#!/usr/bin/env bash
set -o nounset
set -o errexit
trap 'echo "Aborting due to errexit on line $LINENO. Exit code: $?" >&2' ERR
set -o errtrace
set -o pipefail

function gif2mp4 {
  # https://unix.stackexchange.com/a/294892
  ffmpeg -hide_banner -loglevel panic -i "$1" -movflags faststart -pix_fmt yuv420p -vf "scale=trunc(iw/2)*2:trunc(ih/2)*2" "$1.mp4"
  exiftool -overwrite_original "-alldates<filename" "-filemodifydate<filename" "$1.mp4"
}

# https://unix.stackexchange.com/a/9499
OIFS="$IFS"
IFS=$'\n'
for file in `find . -type f -name "$1" -maxdepth 1 -name "*.gif"`
do
  gif2mp4 "$file"
done
IFS="$OIFS"