File Name Pattern Elements

Elements from file name and/or audio stream

%filename%	Output file name (created from the input file name).
%filetype%	Output file type, e.g. mp3.
%language%	Language (for file with multiple audio streams).
%streamid%	Audio stream index.
%codec%	Input file Codec.
%nchannel%	Channel number (used in "Split into file per channel").
%originalfilename%	Input file name (used in "Split By" file name pattern).

Metadata elements

%albumartist%	Album artist
%artist%	Artist
%album%	Album
%track%	Track
%track2%	2 digit track number, i.e. values 1-9 will be prepended with a zero (01, 02, etc.)
%disc%	Disc
%disc2%	See %track2%
%title%	Title
%year%	Year
%date%	Date
%genre%	Genre

Date conversion elements (taken from Linux)

%%	a literal %
%a	locale's abbreviated weekday name (e.g., Sun)
%A	locale's full weekday name (e.g., Sunday)
%b	locale's abbreviated month name (e.g., Jan)
%B	locale's full month name (e.g., January)
%c	locale's date and time (e.g., Thu Mar 3 23:05:25 2005)
%C	century; like %Y, except omit last two digits (e.g., 20)
%d	day of month (e.g., 01)
%D	date; same as %m/%d/%y
%e	day of month, space padded; same as %_d
%F	full date; same as %Y-%m-%d
%g	last two digits of year of ISO week number (see %G)
%G	year of ISO week number (see %V); normally useful only with %V
%h	same as %b
%H	hour (00..23)
%I	hour (01..12)
%j	day of year (001..366)
%k	hour, space padded ( 0..23); same as %_H
%l	hour, space padded ( 1..12); same as %_I
%m	month (01..12)
%M	minute (00..59)
%n	a newline
%N	nanoseconds (000000000..999999999)
%p	locale's equivalent of either AM or PM; blank if not known
%P	like %p, but lower case
%r	locale's 12-hour clock time (e.g., 11:11:04 PM)
%R	24-hour hour and minute; same as %H:%M
%s	seconds since 1970-01-01 00:00:00 UTC
%S	second (00..60)
%t	a tab
%T	time; same as %H:%M:%S
%u	day of week (1..7); 1 is Monday
%U	week number of year, with Sunday as first day of week (00..53)
%V	ISO week number, with Monday as first day of week (01..53)
%w	day of week (0..6); 0 is Sunday
%W	week number of year, with Monday as first day of week (00..53)
%x	locale's date representation (e.g., 12/31/99)
%X	locale's time representation (e.g., 23:13:48)
%y	last two digits of year (00..99)
%Y	year

Examples

%filename%_(%streamid%[_%language%][_%stream_name%])	Output file name will be like inputfilename_(1_eng_main track)
0%nchannel%_%filename%	Output file name will be like 01_inputfilename, 02_inputfilename, etc.