#!/usr/bin/env bash
set -euo pipefail

# ensure existence of destination folder
dir="$(pwd)"
dest=${dir%/*}/${dir##*/}_reencode
if [[ !(-d $dest) ]]; then
   mkdir "$dest"
fi

for file in ./*.$1; do
   echo "ffmpeg -i '$file' -c:a copy -map 0:0 '$dest/$file'";
   ffmpeg -i "$file" -c:a copy -map 0:0 "$dest/$file";
done