Info(3pm)						User Contributed Perl Documentation						 Info(3pm)

NAME

       MP4::Info - Fetch info from MPEG-4 files (.mp4, .m4a, .m4p, .3gp)

SYNOPSIS

	       #!perl -w
	       use MP4::Info;
	       my $file = 'Pearls_Before_Swine.m4a';

	       my $tag = get_mp4tag($file) or die "No TAG info";
	       printf "$file is a %s track
", $tag->{GENRE};

	       my $info = get_mp4info($file);
	       printf "$file length is %d:%d
", $info->{MM}, $info->{SS};

	       my $mp4 = new MP4::Info $file;
	       printf "$file length is %s, title is %s
",
		       $mp4->time, $mp4->title;

DESCRIPTION

       The MP4::Info module can be used to extract tag and meta information from MPEG-4 audio (AAC) and video files. It is designed as a drop-in
       replacement for MP3::Info.

       Note that this module does not allow you to update the information in MPEG-4 files.

       $mp4 = MP4::Info->new(FILE)
	   OOP interface to the rest of the module. The same keys available via "get_mp4info" and "get_mp4tag" are available via the returned
	   object (using upper case or lower case; but note that all-caps 'VERSION' will return the module version, not the MPEG-4 version).

	   Passing a value to one of the methods will not set the value for that tag in the MPEG-4 file.

       use_mp4_utf8([STATUS])
	   Tells MP4::Info whether to assume that ambiguously encoded TAG info is UTF-8 or Latin-1. 1 is UTF-8, 0 is Latin-1. Default is UTF-8.

	   Function returns new status (1/0). If no argument is supplied, or an unaccepted argument is supplied, function merely returns existing
	   status.

	   This function is not exported by default, but may be exported with the ":utf8" or ":all" export tag.

       get_mp4tag (FILE)
	   Returns hash reference containing the tag information from the MP4 file.  The following keys may be defined:

		   ALB	   Album
		   APID    Apple Store ID
		   ART	   Artist
		   CMT	   Comment
		   COVR    Album art (typically JPEG or PNG data)
		   CPIL    Compilation (boolean)
		   CPRT    Copyright statement
		   DAY	   Year
		   DISK    Disk number & total (2 integers)
		   GNRE    Genre
		   GRP	   Grouping
		   NAM	   Title
		   RTNG    Rating (integer)
		   TMPO    Tempo (integer)
		   TOO	   Encoder
		   TRKN    Track number & total (2 integers)
		   WRT	   Author or composer

	   For compatibility with MP3::Info, the MP3 ID3v1-style keys TITLE, ARTIST, ALBUM, YEAR, COMMENT, GENRE and TRACKNUM are defined as
	   synonyms for NAM, ART, ALB, DAY, CMT, GNRE and TRKN[0].

	   Any and all of these keys may be undefined if the corresponding information is missing from the MPEG-4 file.

	   On error, returns nothing and sets $@.

       get_mp4info (FILE)
	   Returns hash reference containing file information from the MPEG-4 file.  The following keys may be defined:

		   VERSION	   MPEG version (=4)
		   LAYER	   MPEG layer description (=1 for compatibility with MP3::Info)
		   BITRATE	   bitrate in kbps (average for VBR files)
		   FREQUENCY	   frequency in kHz
		   SIZE 	   bytes in audio stream

		   SECS 	   total seconds, rounded to nearest second
		   MM		   minutes
		   SS		   leftover seconds
		   MS		   leftover milliseconds, rounded to nearest millisecond
		   TIME 	   time in MM:SS, rounded to nearest second

		   COPYRIGHT	   boolean for audio is copyrighted
		   ENCODING	   audio codec name. Possible values include:
				   'mp4a' - AAC, aacPlus
				   'alac' - Apple lossless
				   'drms' - Apple encrypted AAC
				   'samr' - 3GPP narrow-band AMR
				   'sawb' - 3GPP wide-band AMR
				   'enca' - Unspecified encrypted audio
		   ENCRYPTED	   boolean for audio data is encrypted

	   Any and all of these keys may be undefined if the corresponding information is missing from the MPEG-4 file.

	   On error, returns nothing and sets $@.

BUGS

       Doesn't support writing tag information to MPEG-4 files.

       If you find a bug, please send me a patch. If you cannot figure out why it does not work for you, please put the MP4 file in a place where
       I can get it (preferably via FTP, or HTTP) and send me mail regarding where I can get the file, with a detailed description of the problem.
       I will keep a copy of the file only for as long as necessary to debug the problem.

AUTHOR

       Jonathan Harris <jhar@cpan.org>.

THANKS

       Chris Nandor <pudge@pobox.com> for writing MP3::Info

       Dan Sully at Slim Devices for cover art and iTunes/aacgain metadata patches.

       Ruben Laguna for PSP support.

SEE ALSO

       MP4::Info Project Page
	   <http://search.cpan.org/~jhar/MP4-Info>

       ISO 14496-12:2004 - Coding of audio-visual objects - Part 12: ISO base media file format
	   <http://www.iso.ch/iso/en/ittf/PubliclyAvailableStandards/c038539_ISO_IEC_14496-12_2004(E).zip>

       ISO 14496-14:2003 - Coding of audio-visual objects - Part 14: MP4 file format
	   <http://www.iso.org/iso/en/CatalogueDetailPage.CatalogueDetail?CSNUMBER=38538> (Not worth buying - the interesting stuff is in Part
	   12).

       3GPP TS 26.244 - 3GPP file format(3GP)
	   <http://www.3gpp.org/ftp/Specs/html-info/26244.htm>

       QuickTime File Format
	   <http://developer.apple.com/documentation/QuickTime/QTFF/>

       ISO 14496-1 Media Format
	   <http://www.geocities.com/xhelmboyx/quicktime/formats/mp4-layout.txt>

       MP3::Info
	   <http://search.cpan.org/~cnandor/MP3-Info/>

COPYRIGHT and LICENSE
       Copyright (c) 2004-2010, Jonathan Harris <jhar@cpan.org>

       This program is free software; you can redistribute it and/or modify it under the the same terms as Perl itself.

perl v5.10.1							    2010-07-30								 Info(3pm)