Added Dockerfile and conversion script

Dockerfile

@@ -0,0 +1,13 @@
+FROM ubuntu:artful
+
+RUN apt update \
+ && apt install ffmpeg -y \
+ && rm /var/lib/apt/lists/* /var/log/* -Rf
+
+ADD script.sh /
+
+VOLUME ["/music"]
+
+WORKDIR /music
+
+ENTRYPOINT ["/bin/sh", "/script.sh"]

script.sh

@@ -0,0 +1,6 @@
+#!/bin/bash
+
+for f in *.wav
+do
+    ffmpeg -i "$f" -ab 320k -map_metadata 0 -id3v2_version 3 "${f%.wav}.mp3"
+done