-May be given multiple times to 'pipe' the stream
-through arbitrary many filters in an efficient
-way. The same filter may appear more than once,
-order matters.
+option "filter" f
+#~~~~~~~~~~~~~~~~
+"Specify filter."
+string typestr="filter_spec"
+optional
+multiple
+details="
+ May be given multiple times to 'pipe' the stream through
+ arbitrary many filters in an efficient way. The same filter
+ may appear more than once, order matters.