sync/scripts/transcode_m4a.sh

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#!/usr/bin/env bash
set -euo pipefail
for file in ./*.$1; do
map=''
if [[ $# > 1 && "$2" == 'map' ]]; then
map='-map 0:0'
fi
echo "ffmpeg -i '$file' -c:a libfdk_aac -profile:a aac_he -b:a 64k -movflags +faststart $map '../m4a/${file%$1}m4a'"
ffmpeg -i "$file" -c:a libfdk_aac -profile:a aac_he -b:a 64k -movflags +faststart $map "../m4a/${file%$1}m4a"
done