+$movie_file_ext = "-iregex \".*\.mov\" -o -iregex \".*\.3gp\" -o -iregex \".*\.avi\" -o -iregex \".*\.mp4\" -o -iregex \".*\.mpg\" -o -iregex \".*\.mts\" -o -iregex \".*\.m4v\"";
+
+# Which movie file extensions should not be recompressed for merging
+$no_recompress_file_ext = qr/\.(mp4)$/;