add "\n" for print only convert mp4

@@ -1002,7 +1002,7 @@ int process_files()
 int process_only_mp4_files()
 {
 	//only convert mp4 to ts,don't merge
-	printf("\only convert mp4 files!\n");
+	printf("\nonly convert mp4 files!\n");
 	char outputfile[1024];
 	init();