Transcript An Overview of MPEG-21 - McGill Schulich Faculty of Music

An Overview of MPEG-21
Cory McKay
Introduction
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Built on top of MPEG-4 and MPEG-7 standards
Much more than just an audiovisual standard
Meant to be a tool for delivering data in a
broader sense
Emphasis put on being able to distribute data
over a wide range of networks and devices
Introduction
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Want to integrate technologies of creation,
distribution, packaging and consumption
ISO discusses MPEG-21 as a "Multimedia
Framework" used to distribute "Digital
Items“
Digital items store both binary and text
data
Makes use of XML
Status
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Standard is still in being developed
Started in 2000
Coordinated by the ISO Motion Picture
Group
Isn’t expected to be completed for several
more years
Status
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MPEG issues calls for proposals and meets with
representatives of industry and other standards
bodies to discuss then
Released so far:
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Technical Report
Digital Item Declaration Standard: uses XML to
provide a model for defining digital items
Digital Item Identification Declaration Standard:
allows unique identification of digital items and their
components
Status
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Still being worked on:
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Intellectual Property Management and Protection
Rights Expression Language
Rights Data Dictionary
Digital Item Adaptation
Reference Software
File Format
Digital Item Processing
Evaluation Tools for Persistent Association
Test Bed for Resource Delivery
Scope
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Will define key elements needed to deliver
content and the relations and operations that
link them
Level of detail of recommendations will vary for
each framework element and will concentrate on
interoperability
Will define syntax and semantics used to specify
elements and the protocols associating
interfaces
Actual implementation of framework elements
below the abstraction level will not be specified
Official Goals
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“… describe an open framework which allows
the integration of all components of a delivery
chain necessary to generate, use, manipulate,
manage, and deliver multimedia content across
a wide range of networks and devices.”
“… define the technology needed to support
Users to exchange, access, consume, trade and
otherwise manipulate Digital Items in an efficient,
transparent and interoperable way.”
Official Goals
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Underlying idea is to “bringring technology
and content standards together”
ISO puts emphasis on facilitating digital
commerce and ensuring intellectual
property rights
Goals are both both ambitious and vague
Sample Uses – Images
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Allow users to transfer still and video images
between networks and devices (digital cameras,
digital video cameras, PCs, webTV, PDAs,
printers, etc.) using a single standard
Add additional information such as voice and
text to images if needed
Embed descriptive data in digital items that can
be used to search for them on networks or
databases
Sample Uses – Databases
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Store many different types of data and
search keys in a single digital item
Make each component of a digital item
extractable in such a way that it maintains
information about itself and its relation to
other components
Only allow authorized users to view or edit
certain components of a digital item
Sample Uses – Commerce
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Allow vendors to send a digital items that
contain information about products as well as
forms that users could fill out to make purchases
Allow user navigation of digital items (e.g. click
on a map to see flight routes to a certain city)
Enable digital items to automatically check
periodically over a network to see if they should
update themselves to reflect new developments
Sample Uses – Commerce
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Facilitate encryption to ensure privacy of
information such as credit card numbers
Rules relating to varying levels of user access
can be embedded in digital items
Conditions under which a digital item can be
reproduced can be controlled (copyright control)
Authour information can be irrevocably
embedded in digital items (intellectual property
rights)
Sample Uses – Entertainment
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Allow video games to be run from a digital
item
Combine diverse types of media in a
original and interactive ways
Sample Uses – Music
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Store both MIDI and audio tracks in a single
digital item
Store lyrics and score information along with
audio. Videos, set designs, Max patches, etc.
could also be stored
Useful for collaborative compositions. Could edit
all components together or separately
Secure streaming of multiple types of
information
Summary of Priorities
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Store a wide range of multimedia (and other)
data
A digital item can store descriptive information
about itself as a whole, its components and its
relation to external data
Able to be recorded, edited, viewed and stored
on many different types of systems using many
different types of tools with as little loss of
functionality or quality as possible
Capabilities can expand as technology changes
Summary of Priorities
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Ensure privacy
Control reproducibility and embed information
about original authour
Allow interactive use
Can automatically update itself and interact with
other objects over networks.
Can be transmitted on any network to any
device
Ensure minimum quality of service during
transfers
Conclusion
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Very ambitious project
Has a great deal of potential
Has political and ethical ramifications in
terms of freedom of access to information
and intellectual property rights
Still a lot of work to be done
Bibliography
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ISO Moving Picture Experts Group. 2003.
MPEG Home Page [online]. Available from
World Wide Web:
(http://mpeg.telecomitalialab.com/)
ISO Moving Picture Experts Group. 2002.
MPEG-21 Overview v.5 [online]. Available from
World Wide Web:
(http://mpeg.telecomitalialab.com/standards/mp
eg-21/mpeg-21.htm)
Bibliography
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ISO Moving Picture Experts Group. 2001.
MPEG-21 Use Case Scenarios v2.0
[online]. Available from World Wide Web:
(http://ipsi.fraunhofer.de/delite/Projects/MP
EG7/Documents/W4330%20M21%20Use
%20Cases.html)
Bibliography
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ISO Moving Picture Experts Group. 2003.
MPEG Working Documents [online]. Available
from World Wide Web:
(http://mpeg.telecomitalialab.com/working_docu
ments.htm)
Koenen, Rob. 2001. From MPEG-1 to MPEG21: Creating an Interoperable Multimedia
Infrastructure [online]. ISO Moving Picture
Experts Group. Available from World Wide Web:
(http://mpeg.telecomitalialab.com/documents/fro
m_mpeg-1_to_mpeg-21.htm)