diff --git a/scripts/transcode_m4a.sh b/scripts/transcode_m4a.sh
new file mode 100755
index 0000000..e8adb59
--- /dev/null
+++ b/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
+