MP3INFO2(1) User Contributed Perl Documentation MP3INFO2(1)NAMEmp3info2 - 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.
· 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).
· If options "-d" or "-F" were given.
· 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
· Deletion of ID3v1 or ID3v2 as a whole via "-d" option;
· Recipies of "-P" option are set up (to be triggered by
interpolation);
· The setting done via "-a/-t/-l/-y/-g/-c/-n" options;
· The settings done via "-F" option;
· Deletion of individual frames via "-d" option;
· autofill of ID3v2 (id) frames;
· Emit info based on "-p" and "-x" options;
· Trigger recipies of "-P" (if not triggered by interpolation);
· 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 v5.20.2 2010-03-07 MP3INFO2(1)
