new: script for transcoding audio files to m4a(AAC)

scripts/transcode_m4a.sh

@@ -0,0 +1,12 @@
+#!/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
+