add mp4-to-mp3.sh

Signed-off-by: Colin McCabe <cmccabe@alumni.cmu.edu>

diff --git a/mp4-to-mp3.sh b/mp4-to-mp3.sh
new file mode 100755 (executable)
index 0000000..0259f7b
--- /dev/null
+++ b/mp4-to-mp3.sh
@@ -0,0 +1,5 @@
+#!/bin/bash
+
+FILE=$1
+echo "Re-encoding audio from ${FILE}..."
+ffmpeg -i "${FILE}" -vn -ac 2 -ar 44100 -ab 220k -f mp3 "${FILE}.mp3"