Modelling Music Albums In Modern File Formats

Modelling Music Albums Modelling Music Albums in Modern File Formatsin Modern File Formats

Michael Grafl@mykey_

Barcamp Klagenfurt07.02.2010

ContentContent

IntroductioniTunesLPMusicDNAMPEG-21 File Format (.m21)MPEG-21 Digital ItemMusic Album in .m21 File

VLC MPEG-21-PluginBackwards Compatibility

Conclusion

07.02.2010 Modelling Music Albums in Modern FileFormats Michael Grafl 2

IntroductionIntroduction


Store music album + metadata in a single file

iTunesLPiTunesLP



MusicDNAMusicDNA

MPEG-21 File Format (.m21)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 ItemMPEG-21 Digital Item

Fundamental concept in MPEG-21Structured digital objectUniquely identifiableBinds metadata to content

Digital Item Declaration Language (DIDL)XML-based representation


MPEG-21 Digital ItemMPEG-21 Digital Item


Album Album TrackTrack

ID (EAN, UPC, ...)ArtistTitleComposer, CompanyDate, Country, LanguageGenre CopyrightDescriptionHomepageParental-RatingCover Art

ArtistTitleComposer, CompanyDurationCoding-FormatSize, BitrateDateTrack-NumberGenreCopyrightLyrics


Music Album in .m21 FileMusic Album in .m21 File

Creation of .m21 files:Command line tool Based on GPAC Project on Advanced ContentUses MusicBrainz.org for initial metadata

.m21 file compatible with MP4

Media Player Plugin:Plugin for VLC Media PlayerBased on the built-in MP4-Plugin


VLC MPEG-21-PluginVLC MPEG-21-Plugin

Demultiplexer module

Detect and play .m21 files

Show tracks in the playlist

Show cover art

Show additional metadata


VLC MPEG-21-PluginVLC MPEG-21-Plugin


Backwards CompatibilityBackwards Compatibility

VLC can play .m21 files even without the pluginTreats the file as .mp4


ConclusionConclusion

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-


THANK YOU FOR YOUR THANK YOU FOR YOUR ATTENTION!ATTENTION!

(Backup Slides)(Backup Slides)

MPEG-21 Part 9: File FormatMPEG-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 1712.10.2009

mp21_creatormp21_creator: Architecture: Architecture

MPEG-21 File Format: Player & Authoring SW 1812.10.2009

File SizesFile Sizes

MPEG-21 File Format: Player & Authoring SW 19

Album: Jennifer Lopez -

"Como ama una mujer"

12.10.2009

File Sizes (Detail)File Sizes (Detail)

MPEG-21 File Format: Player & Authoring SW 20

Album: Jennifer Lopez -

"Como ama una mujer"

12.10.2009

Modelling Music Albums In Modern File Formats

Technology

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