add stereo to mono script

scripts/find_stereo.sh

@@ -0,0 +1,17 @@
+#!/usr/bin/env bash
+
+filter='pan=mono|c0=0.5*FL+-0.5*FR,silenceremove=start_periods=1:detection=peak'
+
+for f in $@
+do
+   out=$(ffmpeg -nostdin -loglevel error -i "$f" -filter_complex "$filter" -t 0.00002 -f crc -)
+
+   if [[ "$out" != 'CRC=0x00000001' ]]
+   then
+      other="${f%.ogg}.1.ogg"
+      echo "$f is stereo, converting"
+      ffmpeg -i "$f" -ac 1 "$other" && mv "$other" "$f"
+   fi
+done
+
+## EOF