-for i in $1/*.ppm; do
- convert $i $1/$(basename $i ppm)png
-done
+#for i in $1/*.ppm; do
+# convert $i $1/$(basename $i ppm)png
+#done
-mencoder mf://$1/*.png -ovc copy -o $1/md.avi >/dev/null 2>&1
+OUTFILE=md.avi
+[ -n "$2" ] && OUTFILE=$2
+
+mencoder mf://$1/*.png -ovc copy -o $1/$OUTFILE >/dev/null 2>&1