option "loglevel" l "set loglevel (0-6)" int typestr="level" default="4" no option "filter" f "Specify filter. 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. Filter options may be specified for each '-f' option separately. Insinde these options ':' must be used as the separator instead of white space. Example: -f compress:--anticlip:--volume:2 " string typestr="filter_spec" no multiple option "list_filters" L "print list of available filters and exit" flag off