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MP3INFO2(1)	      User Contributed Perl Documentation	   MP3INFO2(1)

NAME
       mp3info2	- get/set MP3 tags; uses MP3::Tag to get default values.

SYNOPSIS
	 # Print the information in tags and autodeduced info
	 mp3info2 *.mp3

	 # In addition,	set the	year field to 1981
	 mp3info2 -y 1981 *.mp3

	 # Same	without	printout of info, recursively in the current directory
	 mp3info2 -R -p	"" -y 1981 .

	 # Do not deduce any field, print (normalized) info from the tags only
	 mp3info2 -C autoinfo=ID3v2,ID3v1 *.mp3

	 # As above, but without normalization/autofill, the raw information in	tags
	 mp3info2 -N *.mp3

	 # As above, but only with ID2v1 tag read
	 mp3info2 -NC autoinfo=ID3v1 *.mp3

	 # Get artist from CDDB_File, autodeduce other info, write it to tags
	 mp3info2 -C artist=CDDB_File -u *.mp3

	 # For title, prefer information from .inf file; autodeduce rest, update
	 mp3info2 -C title=Inf,ID3v2,ID3v1,filename -u *.mp3

	 # Same, and get the artist from CDDB file
	 mp3info2 -C title=Inf,ID3v2,ID3v1,filename -C artist=CDDB_File	-u *.mp3

	 # Write a script for conversion of .wav to .mp3, autodeducing tags
	 mp3info2 -p "lame -h --vbr-new	--tt '%t' --tn %n --ta '%a' --tc '%c' --tl '%l'	--ty '%y' '%f'\n" *.wav	>xxx.sh

DESCRIPTION
       The program prints a message summarizing	tag info (obtained via
       MP3::Tag	module)	for specified files.

       It may also update the information in ID3 tags.	This happens in	three
       different cases.

       o   If the information supplied in command-line options "t a l y	g c n"
	   differs from	the content of the corresponding ID3 tags (or there is
	   no corresponding ID3	tags).

       o   If options "-d" or "-F" were	given.

       o   if "MP3::Tag" obtains the info from other means than	MP3 tags, and
	   "-u"	forces the update of the ID3 tags.

       (All these ways are disabled by "-D" option.)  ID3v2 tag	is written if
       needed, or if "-2" option is given.  (Automatic fill-in of deduceable
       fields (via the method id3v2_frames_autofill()) is performed unless
       "-d" or "-N" options are	given.)

       The option "-u" writes ("u"pdates) the fetched information to the MP3
       ID3 tags.  This option is assumed if there are command-line options
       which explicitly	set tag	elements ("-a",	"-t" etc., and "-F", "-d").
       (Effects	of this	option may be overridden by giving "-D"	option.)  If
       "-2" option is also given, forces write of ID3v2	tag even if the	info
       fits the	ID3v1 tag (in addition,	this option enables auto-update	of
       "personal name" fields, and corresponding titles	according to values of
       "translate_person", "person_frames" etc.	 configuration settings; see
       "Normalization of fields").  This option	is ignored if no change	to
       tags is detected; however, one can force	an update by repeating this
       option (useful if you expect the	change the "format" of the tag,	as
       opposed to its "content").

       The option "-p" prints a	message	using the next argument	as format (by
       default "\\", "\t", "\n"	are replaced by	backslash, tab and newline;
       governed	by the value of	"-E" option); see "interpolate"	in MP3::Tag
       for details of the format of sprintf()-like escapes.  If	no option "-p"
       is given, message in default format will	be emitted.  The value of
       option "-e" is the encoding used	for the	output;	if the value is	a
       number, system-specific encoding	is guessed (and	used for the output if
       bit 0x1 is set);	if bit 0x2 is set, then, command line options are
       assumed to be in	the guessed encoding; if bit 0x4 is set, then, command
       line arguments are assumed to be	in the guessed encoding.  Use the
       value "binary" to do binary output.

       With option "-D"	(dry run) no update is performed, no matter what the
       other options are.  With	this option, no	parsing	of tags	is performed
       unless needed.

       Use options

	 t a l y g c n

       to overwrite the	information (title artist album	year genre comment
       track-number) obtained via "MP3::Tag" heuristics	("-u" switch is
       implied if any one of these arguments differs from what would be	found
       otherwise; use "-D" switch to disable auto-update).  By default,	the
       values of these options are not "%"-interpolated; this may be changed
       by "-E" option.

       The option "-d" should contain the comma-separated list of ID3v2	frames
       to delete.  A frame specification is the	same as	what might be given to
       "%{...}"	frame interpolation command, e.g., "TIT3", "COMM03",
       "COMM(fra)[short	title]"; the difference	with modify-access is that ALL
       (and not	the first of) matching frames are deleted.  (Option -d may be
       repeated.)

       For example, "-d	APIC" would remove all picture frames.	In addition,
       if the list contains "ID3v1" or "ID3v2",	whole tags will	be deleted.

       Likewise, the option "-F" allows	setting	of arbitrary "ID3v2" frames:
       if one needs to set one frame, use the directive	"FRAME_spec=VALUE":

	 -F TIT2=The_new_Title

       Again, on modify, ALL matching frames are deleted first,	so be carefull
       with

	 -F COMM=MyComment

       Option "-F" may be repeated to set more than one	frame.	If
       configuration variable "empty-F-deletes"	is TRUE	(default), empty
       arguments will delete the frame.

       One can replace "FRAME_spec=VALUE" by "FRAME_spec < FILE"; in this case
       the value to set	is read	from the file named FILE; if the frame is
       text-only (meaning: at most "[encoded]Text URL Language Description"
       fields are present), the	file is	read in	text mode (and with
       starting/trailing whitespace stripped), otherwise it is read in binary
       mode.  (Whitespace is required about the	"<" signs.)  If	"<" is
       replaced	by "?<", the value is set only if frame	is not yet present,
       and if the file exists; if replaced by ">", the value (if present) is
       written to FILE (creation of intermediate directories is	controlled by
       configuration option "frames_write_creates_dirs", the default is
       FALSE).

       Additionally, "FRAME_spec" may be one of	"ID3v1"	or "ID3v2" or "TAGS";
       in this case, whole tags	are written or read.  For example, for "TAGS <
       FILE", "title artist album year genre comment track" info is calculated
       from FILE, which	may be raw tags, as produced with ">", or a valid MP3
       file; if	Image::ExifTool	is present, the	data may be read from
       arbitrary multimedia file.  (Likewise,  for "ID3v1 < FILE", the same
       info is extracted from "ID3v1" tag only.) After this, in	case of
       "ID3v2" or "TAGS", "ID3v2" frames are copied from the "ID3v2" tag one-
       by-one.	(With suitable modifications for "?<".)

       By default, the "VALUE" for "-F"	is "%"-interpolated; this can be
       changed by option "-E".	For user convenience, human-friendlier forms
       "composer, text_by, orchestra, conductor, disk_n" can be	used instead
       of "TCOM, TEXT, TPE2, TPE3, TPOS".

       The option "-P RECIPE" is a very	powerful generalization	of what	can be
       done by options "-F", "-d", and "-t -a -l -y -g -c -n".	It may be
       repeated; the values should contain the parse recipes.  They become the
       configuration item "parse_data" of "MP3::Tag"; eventually this
       information is processed	by MP3::Tag::ParseData module (if the latter
       is present in the chain of heuristics; see option "-C").	 The "RECIPE"
       is split	into "$flags, $string, @patterns" on its first non-
       alphanumeric character; the first of @patterns which matches $string is
       going to	be executed (for side effects).	 (See examples:	"EXAMPLES:
       parse rules".)

       If option "-G" is specified, the	file names on the command line are
       considered as glob patterns.  This may be useful	if the maximal
       command-line length is too low.	With the option	"-R" arguments can be
       directories, which are searched recursively for audio (default *.mp3)
       files to	process; use option "-r" to reset the regular expression to
       look for	(the default is	"(?i:\.mp3$)").

       The option "-E" controls	expansion of escape characters.	 It should
       contain the letters of the command-line options where "\\, \n, \t" are
       interpolated; one can append the	letters	of "t a	l y g c	n F" options
       requiring "%"-interpolation after the separator "/i:" (for "-F",	only
       the values are interpolated).  The default value	is "p/i:Fp": only "-p"
       is "\"-interpolated, and	only "-F" and "-p" are subject to
       "%"-interpolation.  If all one wants is to add to the defaults, preceed
       the value of "-E" (containing added options) by "+".  (Some parts of
       the value of option "-P"	are interpolated, but this should be governed
       by flags, not "-E"; do NOT put "P" into the "%"-interpolated part of
       "-E".)

       If the option "-@" is given, all	characters "@" in the options are
       replaced	by "%".	 This may be convenient	if the shell treats "%"
       specially (e.g.,	DOSISH shells).

       If option "-I" is given,	no guessworking	for artist field is performed
       on typeout.

       The option "-C CONFIG_OPT=VALUE1,VALUE2..." sets	"MP3::Tag"
       configuration data the same way as "MP3::Tag-"config()> would do
       (recall that the	value is an array; separate elements by	commas if more
       than one).  The option may be repeated to set more than one value.
       Note that since "ParseData" is used to process "-P" parse recipes, it
       should be better	be kept	in the "autoinfo" configuration	(and related
       fields "author" etc) in presence	of "-P".

       If the option "-x" is given, the	technical information about the	audio
       file is printed (MP3 level, duration, number of frames, padding,
       copyright, and the list of ID3v2	frame names in format suitable to
       "%{...}"	escapes).  If "-x" is repeated,	content	of frames is also
       printed out (may	output non-printable chars, if it is repeated more
       than twice).

       If option "-N" is given,	all the	"smarts" are disabled -	no
       normalization of	fields happens,	and (by	default) no attempt to deduce
       the values of fields from non-ID3 information is	done.  This option is
       (currently) equivalent to having	"-C autoinfo=ParseData,ID3v2,ID3v1" as
       the first directive, to having no Normalize::Text::Music_Fields.pm
       present on @INC path, and not calling autofill()	method.

Normalization of fields
       (The loading of normalization module and	all subsequent operations may
       be disabled by the option "-N", or by setting the environment variable
       "MP3TAG_NORMALIZE_FIELDS" to be FALSE.  If not prohibited, the module
       is attempted to be loaded if directory ~/.music_fields is present, or
       "MP3TAG_NORMALIZE_FIELDS" is set	and TRUE.)

       If loading of the module	"Normalize::Text::Music_Fields"	is successful,
       the following is	applicable:

       If the value of "MP3TAG_NORMALIZE_FIELDS" is defined and	not 1, this
       value is	broken into directories	as a PATH, and load path of
       "Normalize::Text::Music_Fields" is set to be this list of directories.
       Then MP3::Tag is	instructed (via	corresponding configuration settings)
       to use "normalize_artist" (etc.)	methods	defined	by this	module.	 These
       methods may normalize certain tag data.	The current version defines
       methods for "normalization" of personal names, and titles (based	on the
       composer).  This	normalization is driven	through	user-editable
       configuration tables.

       In addition to automatical normalization	of MP3 tag data, one can use
       "fake MP3 files"	to manually access some	features of this module.  For
       this, use an empty file name, and "-D" option.  E.g,

	 mp3info2 -D -a	beethoven			-p "%a\n"	  ""
	 mp3info2 -D -a	beethoven			-p "%{shP[%a]}\n" ""
	 mp3info2 -D -a	beethoven -t "sonata #28"	-p "%t\n"	  ""
	 mp3info2 -D -a	beethoven -t "allegretto, Bes" -@p "@t\n"	  ""
	 mp3info2 -D -a	beethoven -t "op93"	       -@p "@t\n"	  ""

       will print the normalized person-name for "beethoven", the
       corresponding normalized	short person-name, and the normalized title
       for "sonata #28"	of composer "beethoven".  E.g.,	with the shipped
       normalization tables, it	will print

	 Ludwig	van Beethoven (1770-1827)
	 L. van	Beethoven
	 Piano Sonata No. 28 in	A major; Op. 101 (1816)
	 Allegretto for	Piano Trio in B	flat major; WoO	39 (1812)
	 Symphony No. 8	in F major; Op.	93 (comp. 1812,	f.p. Vienna, 1814-02-27, cond. Beethoven; pubd.	1816)

The order of operation
       Currently, the operations are done in the following order

       o Deletion of ID3v1 or ID3v2 as a whole via "-d"	option;

       o Recipies of "-P" option are set up (to	be triggered by
	 interpolation);

       o The setting done via "-a/-t/-l/-y/-g/-c/-n" options;

       o The settings done via "-F" option;

       o Deletion of individual	frames via "-d"	option;

       o autofill of ID3v2 (id)	frames;

       o Emit info based on "-p" and "-x" options;

       o Trigger recipies of "-P" (if not triggered by interpolation);

       o Update	tags if	needed.

Usage strategy:	escalation of complexity
       The purpose of this script is to	to make	handling of ID3	tags as	simple
       as possible.

       On one end of the scale,	one can	perform	arbitrarily complex
       manipulations with tags using "MP3::Tag"	Perl module.

       On the other end, it is much more convenient to handle simplest
       manipulations with tags using this script's options "-t -a -l -y	-g -c
       -n" and "-p -F -d".  For	slightly more complicated tasks, one may need
       to use the more elaborate method	of parse rules,	provided to this
       script by the option "-P"; the rules depend heavily on interpolation,
       see "interpolate" in MP3::Tag, "interpolate_with_flags" in MP3::Tag.

       To simplify upgrade from	"simplest manipulations" to "more elaborate
       ones", here we provide "parse rule" synonyms to the simplest options.
       So if you start with "-t	-a -l -y -g -c -n" and "-p -F -d" options
       which "almost work" for you, you	have a good chance to be able to fully
       achieve your aim	by modifying the synonyms described below.

       (Below we assume	that "-E" option is set	to its default value, so "-F
       -p" are "%"-interpolated, other options are not.	 Note also that	if
       your TTY's encoding is recognized by Perl, it is	highly recommended to
       set "-e 3" option; on DOSISH shells, better use "-@", and replace "%"'s
       by "@"'s	below.)

       "-t VALUE"
		       -P "mz/VALUE/%t"

       "-a -l -y -g -c -n"
		     Likewise.

       "-F" "TIT2=VALUE"
		       -P "mzi/VALUE/%{TIT2}"

       "-F" "APIC[myDescr] < FILE"
		       -F "APIC[myDescr]=%{I(fimbB)FILE}"

		     or

		       -P "mzi/%{I(fimbB)FILE}/%{APIC[myDescr]}"

		     (remove "bB" for text-only	frames).

       "-F" "APIC[myDescr] > FILE"
		       -P "bOi,%{APIC[myDescr]},FILE"

		     (remove "b" for text-only frames);	or use "-e binary -p
		     "%{APIC[myDescr]}"" with redirection, see "EXAMPLES:
		     parse rules".

       "-d" TIT2
		       -P "m//%{TIT2}"

       "-F" "TIT2 ?< FILE"
		     Very tricky.  This	won't set distinguish empty file and
		     non-existing one:

		       -P "mzi/%{TIT2:1}0%{I(fFim)FILE}/10/10%{TIT2}/0%{U1}"

		     (add "bB" to "fFim" for non-text-only frames); the	last
		     part may be omitted if one	omits the flag "m" - it	is
		     present to	catch misprints	only.

       For details on "parse rules", see "EXAMPLES: parse rules" and
       "DESCRIPTION" in	MP3::Tag::ParseData.

EXAMPLES: parse	rules
       Only the	"-P" option is complicated enough to deserve comments...  For
       full details on parse rules, see	"DESCRIPTION" in MP3::Tag::ParseData;
       for full	details	on interpolation, see "interpolate" in MP3::Tag,
       "interpolate_with_flags"	in MP3::Tag.

       For a (silly) example, one can replace "-a Homer	-t Iliad" by

	 -P mz=Homer=%a	-P mz=Iliad=%t

       A less silly example is forcing a particular way	of parsing a file name
       via

	 -P "im=%{d0}/%f=%a/%n %t.%e"

       It is broken into

	flags	       string	       pattern1
	"im"	       "%{d0}/%f"      "%a/%n %t.%e"

       The flag	letters	stand for interpolate, must_match.  This interpolates
       the string "%{d0}/%f" and parses	the result (which is the file name
       with one	level of the directory part preserved) using the given
       pattern;	thus the directory name	becomes	the artist, the	leading
       numeric part - the track	number,	and the	rest of	the file name (without
       extension) - the	title.	Note that since	multiple patterns are allowed,
       one can similarly allow for multiple formats of the names, e.g.

	 -P "im=%{d0}/%f=%a/%n %t.%e=%a/%t (%y).%e"

       allows for the file basename to be also of the form "TITLE (YEAR)".  An
       alternative way to obtain the same results is

	 -P "im=%{d0}=%a" -P "im=%f=%n %t.%e=%t	(%y).%e"

       which corresponds to two	recipies:

	flags	       string	       pattern1	       pattern2
	"im"	       "%{d0}"	       "%a"
	"im"	       "%f"	       "%n %t.%e"      "%t (%y).%e"

       Of course, one could use

	"im"	       "%B"	       "%n %t"	       "%t (%y)"

       as a replacement	for the	second one.

       Note that it may	be more	readable to set	artist to "%{d0}" by an
       explicit	asignment, with	arguments similar to

	 -E "p/i:Fpa" -a "%{d0}"

       (this value of "-E" requests "%"-interpolation of the option "-a" in
       addition	to the default "\"-interpolation of "-p", and
       "%"-interpolation of "-F" and "-p"; one can shortcut it with "-E
       +/i:a").

       To give more examples,

	 -P "if=%D/.comment=%c"

       will read comment from the file .comment	in the directory of the	audio
       file;

	 -P "ifn=%D/.comment=%c"

       has similar effect if the file .comment has one-line comments, one per
       track (this assumes the the track number	can be found by	other means).

       Suppose that a file Parts in a directory	of MP3 files has the following
       format: it has a	preamble, then has a short paragraph of	information
       per audio file, preceded	by the track number and	dot:

	  ...

	  12. Rezitativ.
	  (Pizarro, Rocco)

	  13. Duett: jetzt, Alter, jetzt hat es	Eile, (Pizarro,	Rocco)

	  ...

       The following command puts this info into the title of the ID3 tag
       (provided the audio file	names are informative enough so	that MP3::Tag
       can deduce the track number):

	mp3info2 -u -C parse_split='\n(?=\d+\.)' -P 'fl;Parts;%=n. %t'

       If this paragraph of information	has the	form "TITLE (COMMENT)" with
       the "COMMENT" part being	optional, then use

	mp3info2 -u -C parse_split='\n(?=\d+\.)' -P 'fl;Parts;%=n. %t (%c);%=n.	%t'

       If you want to remove a dot or a	comma got into the end of the title,
       use

	mp3info2 -u -C parse_split='\n(?=\d+\.)' \
	  -P 'fl;Parts;%=n. %t (%c);%=n. %t' -P	'iR;%t;%t[.,]$'

       The second pattern of this invocation is	converted to

	 ['iR',	'%t' =>	'%t[.,]$']

       which essentially applies the substitution "s/(.*)[.,]$/$1/s" to	the
       title.

       Now suppose that	in addition to Parts, we have a	text file Comment with
       additional info;	we want	to put this info into the comment field	after
       what is extracted from "TITLE (COMMENT)"; separate these	two parts of
       the comment by an empty line:

	mp3info2 -E C -C 'parse_split=\n(?=\d+\.)' -C 'parse_join=\n\n'	\
	 -P 'f;Comment;%c'	     -P	'fl;Parts;%=n. %t'		\
	 -P 'i;%t///%c;%t (%c)///%c' -P	'iR;%t;%t[.,]$'

       This assumes that the title and the comment do not contain '///'	as a
       substring.  Explanation:	the first pattern of "-P",

	 ['f', 'Comment' => '%c'],

       reads comment from the file "Comment" into the comment field; the
       second,

	 ['fl',	'Parts'	 => '%=n. %t'],

       reads a chunk of	"Parts"	into the title field.  The third one

	 ['i', '%t///%c' => '%t	(%c)///%c']

       rearranges the title and	comment	provided the title is of the form
       "TITLE (COMMENT)".  (The	configuration option "parse_join" takes	care
       of separating two chunks	of comment corresponding to two	occurences of
       %c on the right hand side.)

       Finally,	the fourth pattern is the same as in the preceding example; it
       removes spurious	punctuation at the end of the title.

       More examples: removing string "with violin" from the start of the
       comment field (removing comment altogether if nothing remains):

	 mp3info2 -u -P	'iz;%c;with violin%c' *.mp3

       setting the artist field	without	letting	auto-update feature deduce
       other fields from other sources;

	 mp3info2 -C autoinfo=ParseData	-a "A. U. Thor"	*.mp3

       setting a comment field unless it it already present:

	 mp3info2 -u -P	'i;%c///with piano;///%c' *.mp3

       The last	example	shows how to actually write "programs" in the language
       of the "-P" option: the example gives a conditional assignment.	With
       user variables (as in "%{U8}") for temporaries, and a possibility to
       use regular expressions,	one could provide arbitrary programmatic
       logic.  Of course, at some level	of complexity one should better	switch
       to direct interfacing with "MP3::Tag" Perl module (use the code of this
       Perl script as an example!).

       Here is a typical task setting "advanced" id3v2 frames: composer
       ("TCOM"), orchestra ("TPE2"), conductor ("TPE3").  We assume a
       directory tree which contains MP3 files tagged with the following
       conventions: "artist" is	actually a composer; "comment" is of one of
       two forms:

	 Performers; Orchestra;	Conductor
	 Orchestra; Conductor

       To set the specific MP3 frames via "-P" rules, use

	 mp3info2 -@P "mi/@a/@{TCOM}" \
	   -P "mi/@c/@{U1}; @{TPE2}; @{TPE3}/@{TPE2}; @{TPE3}" -R .

       With "-F" options, this can be simplified as

	 mp3info2 -@F "TCOM=@a"	-P "mi/@c/@{U1}; @{TPE2}; @{TPE3}/@{TPE2}; @{TPE3}" -R .

       or

	 mp3info2 -@F "composer=@a" -P "mi/@c/@{U1}; @{TPE2}; @{TPE3}/@{TPE2}; @{TPE3}"	-R .

       To copy ID3 tags	of MP3 files in	the current directory to files in
       directory /tmp/mp3 with the extension .tag (and print "progress
       report"), use

	 mp3info2 -p "@N@E\n" -@P "bODi,@{ID3v2}@{ID3v1},/tmp/mp3/@N.tag" -DNR .

       Since we	did not	use "z"	flag, MP3 files	without	tags are skipped.

       Now suppose that	there are two parallel file hierarchies	of audio
       files, and of lyrics: audio files are in	audio/dir_name/audio_name.mp3
       with corresponding lyrics file in text/dir_name/audio_name.mp3.	To
       attach lyrics to	MP3 files (in "COMM" frame with	description "lyrics"
       in language "eng" - this	is a non-standard location, see	below!), call

	 mp3info2 -@P "fim;../text/@{d0}/@B.txt;@{COMM(eng)[lyrics]}" -Ru .

       inside the directory audio.  (Change "fim" to "Ffim" to ignore the
       audio files for which the corresponding text file does not exist.)  (Of
       course, to follow the specifications, one should	have used the field
       "%{USLT(eng)[]}"	instead	of "%{COMM(eng)[lyrics]}"; see below for
       variations).

       Finish by a very	simple example:	all what the pattern

	 -P 'i;%t;%t'

       does is removal of trailing and leading blanks from the title (which is
       deduced by other	means).

More examples
       With "-F" option, one could set the "USLT" frame	as

	 mp3info2 -@F "USLT(eng)[] < ../text/@{d0}/@B.txt" -Ru .

       Print out such a	frame (in any language)	with

	 mp3info2 -@p "@{USLT[]}\n" file.mp3

       Similarly, to print out the APIC	frame with empty description, use

	 mp3info2 -e binary -@p	"@{APIC[]}" file.mp3 > output_picture_file

       or (with	description "cover")

	 mp3info2 -@P "bOi,@{APIC[cover]},output_picture_file.jpg" audio_07.mp3

       To set such a frame from	file xxx.gif (with the default "Picture	Type",
       "Cover (front)",	and empty description),	do one of

	 mp3info2 -F  "APIC  <		xxx.gif"  file.mp3
	 mp3info2 -@F "APIC[]=@{I(fimbB)xxx.gif}" file.mp3

       The difference of "APIC"	and "APIC[]" is	that the first removes all
       "APIC" frames first, and	the second removes only	all "APIC" frames with
       empty description - but arbitrary image type.  So it may	be more
       suitable	to use the full	specification, as in "APIC(Cover (front))[]".

       To remove "APIC"	frames with empty descriptions,	arbitrary "Picture
       Type"s (and "MIME type"s	which may be correctly calculated by mp3info2,
       e.g., "TIFF/JPEG/GIF/PNG"), use

	 mp3info2 -d "APIC[]" file.mp3

       (note that this wouldn't	free disk space, unless	"shrink" is forced by
       configuration variables).  To do	the same with the "Conductor" picture
       type only, do

	 mp3info2 -d "APIC(Conductor)[]" file.mp3

       To scan through subdirectories, and add file cover.jpg from the
       directory of the	file as	a "default" "APIC" frame, but only if there is
       no "APIC" frame,	and a file exists, do

	 mp3info2 -@F "APIC ?< @D/cover.jpg" -R	.

       This deletes empty frames for date, "TCOP, TENC,	WXXX[],	COMM(eng)[]",
       and removes the leading 0 from track number from	MP3 file in current
       directory:

	 mp3info2 -@ -E	+/i:y -F "TCOP=@{TCOP}"	-F "TENC=@{TENC}"
	   -F "WXXX[]=@{WXXX[]}" -F "COMM(eng)[]=@{COMM(eng)[]}"
	   -y "@y" -P "mi/@n/0@n/@n" *.mp3

Examples on dealing with broken	encodings
       One of principal	weaknesses of ID3 specification	was that it required
       that data is provided in	"latin-1" encoding.  Since most	languages in
       the world are not expressible in	"latin-1", this	lead to	(majority?) of
       ID3 tags	being not standard-conforming.	Newer versions of the specs
       fixed this shortcoming, but the damage was already done.	 Fortunately,
       this script can use abilities of	"MP3::Tag" to convert from non-
       conforming content to a conforming one.

       The following example converts ID3v2 tags which were written in (non-
       standard-conforming) encoding "cp1251" to be in standard-conforming
       encoding.  For the purpose of this example, assume that ID3v1 tags are
       in the same encoding (and that one wants	to leave them in the encoding
       "cp1251"); the files to process are found in the	current	directory and
       (recursively) in	its subdirectories ("set" syntax for DOSISH shells):

	 set MP3TAG_DECODE_V1_DEFAULT=cp1251
	 set MP3TAG_DECODE_V2_DEFAULT=cp1251
	 mp3info2 -C id3v2_fix_encoding_on_write=1 -u2R	.

       For more	information, see "ENVIRONMENT" in MP3::Tag, "config" in
       MP3::Tag, and "CUSTOMIZATION" in	MP3::Tag.

INCOMPATIBILITIES with mp3info
       This tool is loosely modeled on the program mp3info; it is "mostly"
       backward	compatible (especially when in "naive" mode via	"-N"), and
       allows a	very significant superset of functionality.  Known backward
       incompatibilities are:

	 -G -h -r -d -x

       Missing functionality:

	 -f -F -i

       Incompatible "%"-escapes:

	 %e %E	       - absolutely different semantic
	 %v	       - has no	trailing 0s
	 %q	       - has fractional	part
	 %r	       - is a number, not a word "Variable" for	VBR
	 %u	       - is one	less (in presence of descriptor	frame only?)

       Missing "%"-escapes:

	 %b %G

       Backslash escapes: only "\\", "\n", "\t"	supported.

       "-x" prints data	in a different format, not all fields are present, and
       ID3v2 tag names are output.

ENVIRONMENT
       With "-e" 1, 2 or 3, this script	may consult environment	variables
       "LC_CTYPE, LC_ALL, LANG"	to deduce the current encoding.	 No other
       environment variables are directly read by this script.

       Note however, that MP3::Tag module has a	rich set of defaults for
       encoding	settings settable by environment variables; see	"ENVIRONMENT"
       in MP3::Tag.  So	these variables	affect (indirectly) how	this script
       works.

OBSOLETE INTERFACE
       If you do not understand	what it	is about, it is	safe to	ignore this
       announcement:

       The old,	pre-version=1.05 way (by triplication of a separator, without
       repetition of options) to provide multiple commands to "-F" and <-P>
       options is still	supported, but is strongly discouraged.	 (It does not
       conflict	with the current interface.)

AUTHOR
       Ilya Zakharevich	<cpan@ilyaz.org>.

Utilities to create CDDB file
       Good CD reapers (e.g., cdda2wav with option "cddb=0") create a CDDB
       file with fetched information - as far as an Internet connection	is
       present.	 However, if not available, other options exist.

       The scripts (supplied with the distribution in ./examples) can create a
       "stub" CDDB file	basing on:

       fulltoc2fake_cddb.pl   a	dump of	a full TOC of a	CD; create one,	e.g.,
			      by

				readcd -fulltoc	dev=0,1,0 -f=audiocd

       inf2fake_cddb.pl	      directory	of *.inf files (e.g., created by
			      cdda2wav without Internet	connection);

       dir_mp3_2fake_cddb.pl  a	directory of MP3 files ripped from a CD	(via
			      some guesswork).

       Passing this stub to the	script cddb2cddb.pl, it	can be transformed to
       a "filled" CDDB file via	a connection to	some online database.  Use
       "-r" option if multiple records in the database match the CD signature.

	 fulltoc2fake_cddb audiocd.toc | cddb2cddb     > audio.cddb
	 inf_2fake_cddb		       | cddb2cddb     > audio.cddb
	 dir_mp3_2fake_cddb	       | cddb2cddb -r3 > audio.cddb # 3rd record

       When such a CDDB	file is	present, it will be used by MP3::Tag module to
       deduce the information about an audio file.  This information is	(by
       default,	transparently) used by this script.

SEE ALSO
       MP3::Tag, MP3::Tag::ParseData, audio_rename, typeset_audio_dir

perl v5.32.0			  2010-03-07			   MP3INFO2(1)

NAME | SYNOPSIS | DESCRIPTION | Normalization of fields | The order of operation | Usage strategy: escalation of complexity | EXAMPLES: parse rules | More examples | Examples on dealing with broken encodings | ENVIRONMENT | OBSOLETE INTERFACE | AUTHOR | Utilities to create CDDB file | SEE ALSO

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