+MFOPTS="-mf fps=13:type=png"
+#MFOPTS="-mf fps=25:type=png"
+
+OUTFILE=md.avi
+[ -n "$2" ] && OUTFILE=$2
+
+#mencoder mf://$1/*.png -ovc copy -o $1/$OUTFILE >/dev/null 2>&1
+mencoder $MFOPTS mf://$1/*.png -ovc xvid -xvidencopts bitrate=1000 \
+ -o $1/$OUTFILE >/dev/null 2>&1