order matters.
Filter options may be specified for each '-f'
-option separately. Insinde these options ':'
-must be used as the separator instead of white
-space. Example:
+option separately. Note that you will have to
+quote these options like this:
- -f compress:--anticlip:--volume:2
+ -f 'compress --anticlip --volume 2'
"
string typestr="filter_spec" no multiple