Skip conversion if file is still present from a previous run.

refactor_music_library.sh

@@ -84,8 +84,15 @@ find "$OLD_DIR" -type f ! -name "*".mp3 | sort | while read file; do
 	TEMP_FILE="${TEMP_FILE//[^[:alnum:][:space:].]/}"
 	echo "$TEMP_FILE"
 
-	ffmpeg -y -nostdin -hide_banner -loglevel quiet -i "$file" \
-			"${file//$OLD/$INT}".mp3
+	if [[ -s "$TEMP_DIR/$TEMP_FILE" ]]; then
+		echo "*** Skipping file, already exists!"
+		continue
+	fi
+
+	# Actual conversion.
+	ffmpeg -y \
+		-nostdin -hide_banner -loglevel quiet \
+		-i "$file" "${file//$OLD/$INT}".mp3
 	status="$?"
 	if [[ $status != 0 ]]; then
 		echo "*** FAILED: Exited with status '$status'."