Modelling Music Albums In Modern File Formats

Modelling Music Albums in Modern File Formats Michael Grafl @mykey_ Barcamp Klagenfurt 07.02.2010

Content
Introduction
iTunesLP
MusicDNA
MPEG-21 File Format (.m21)
MPEG-21 Digital Item
Music Album in .m21 File
VLC MPEG-21-Plugin
Backwards Compatibility
Conclusion
07.02.2010 Modelling Music Albums in Modern FileFormats Michael Grafl

Introduction
Store music album + metadata in a single file

iTunesLP 07.02.2010 Modelling Music Albums in Modern FileFormats Michael Grafl

MusicDNA 07.02.2010 Modelling Music Albums in Modern FileFormats Michael Grafl

MPEG-21 File Format (.m21)
Standardised, interoperable file format
Has common base with MP4: "MPEG-4 ISO Base Media File Format"
Can be played by VLC with a small plugin
Includes metadata in an XML-based format: DIDL

MPEG-21 Digital Item
Fundamental concept in MPEG-21
S tructured digital object
Uniquely identifiable
Binds metadata to content
Digital Item Declaration Language (DIDL)
XML-based representation

MPEG-21 Digital Item 07.02.2010 Modelling Music Albums in Modern FileFormats Michael Grafl

Album Track
ID (EAN, UPC, ...)
Artist
Title
Composer, Company
Date, Country, Language
Genre
Copyright
Description
Homepage
Parental-Rating
Cover Art
Artist
Title
Composer, Company
Duration
Coding-Format
Size, Bitrate
Date
Track-Number
Genre
Copyright
Lyrics

Music Album in .m21 File
Creation of .m21 files:
Command line tool
Based on GPAC Project on Advanced Content
Uses MusicBrainz.org for initial metadata
.m21 file compatible with MP4
Media Player Plugin:
Plugin for VLC Media Player
Based on the built-in MP4-Plugin

VLC MPEG-21-Plugin
Demultiplexer module
Detect and play .m21 files
Show tracks in the playlist
Show cover art
Show additional metadata

VLC MPEG-21-Plugin 07.02.2010 Modelling Music Albums in Modern FileFormats Michael Grafl

Backwards Compatibility
VLC can play .m21 files even without the plugin
Treats the file as .mp4

Conclusion
Pack music album into a single file and play it with VLC
Add metadata (cover, lyrics, etc.)
Enhanced searchability
Technology could be used to pack an entire DVD-Video into a single file (like iTunesExtras)
To be released on http://sourceforge.net/projects/music-mp21/

THANK YOU FOR YOUR ATTENTION!

(Backup Slides)

MPEG-21 Part 9: File Format ftyp box: major-brand = ‘mp21’, compatible-brands = ‘mp21’. meta box: (container) handler box: hdlr = ‘mp21’ XML box: contains the MPEG-21 DID XML, with a relative URL “image.jpg” for the image Item Location: itemID = 1, extent_count = 1, extent_offset = X, extent_length = Y; Item Info: itemID = 1, item_protection_index = 0 (unused), item_name = “image.jpg”, content_type = “image/jpeg”, content_encoding = “” (binary) Media data box: JPEG Image (at file offset X, with length Y) Quelle: [3] MPEG-21 File Format: Player & Authoring SW 12.10.2009

mp21_creator : Architecture MPEG-21 File Format: Player & Authoring SW 12.10.2009

File Sizes MPEG-21 File Format: Player & Authoring SW Album: Jennifer Lopez - "Como ama una mujer" 12.10.2009

File Sizes (Detail) MPEG-21 File Format: Player & Authoring SW Album: Jennifer Lopez - "Como ama una mujer" 12.10.2009

Modelling Music Albums In Modern File Formats

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