diff --git a/convert.sh b/convert.sh
new file mode 100755
index 0000000..9c4a9fb
--- /dev/null
+++ b/convert.sh
@@ -0,0 +1,13 @@
+#!/bin/bash
+
+if [ ${#} -ne "2" ] ; then
+	echo "Usage: ${0} <input file> <output file>"
+	return 1
+fi
+
+TMPFILE="convert.tmp"
+
+ffmpeg -i ${1} -f s16be -ar 16k -ac 1 -acodec pcm_s16be ${TMPFILE}
+SIZE=$(( $(stat -c "%s" ${TMPFILE}) / 2 ))
+echo -ne "\0$(printf %o $(($SIZE % 256)) )\0$(printf %o $(( ($SIZE / 256) % 256)) )\0$(printf %o $(( ($SIZE / 256**2) % 256)) )\0$(printf %o $(( ($SIZE / 256**3) % 256)) )" | cat - ${TMPFILE} > ${2}
+rm ${TMPFILE}