--- af_pan.c.orig	2013-03-15 02:09:17.000000000 +0200
+++ af_pan.c	2013-04-12 10:06:22.018300000 +0300
@@ -60,7 +60,7 @@
     int64_t layout, layout0;
 
     /* try to parse a channel name, e.g. "FL" */
-    if (sscanf(*arg, "%7[A-Z]%n", buf, &len)) {
+    if (sscanf(*arg, " %7[A-Z] %n", buf, &len)) {
         layout0 = layout = av_get_channel_layout(buf);
         /* channel_id <- first set bit in layout */
         for (i = 32; i > 0; i >>= 1) {