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Authoring Blu-ray
Jerry Pentikäinen
DAP04S
Contents
1.
2.
3.
4.
Introduction
The technology
Blu-ray vs HD-DVD
Authoring on Blu-ray
4.1 HDMV mode
4.2 BD-J mode
5. Authoring software
6. Conclusions
1. Introduction
• Blu-ray (BD) is a next-generation optical disc format developed
by the Blu-ray Disc Association (BDA)
– Apple, Dell, HP, Panasonic, Pioneer, Philips, Samsung, Sony etc.
– Warner, Paramount, Fox, Disney, Sony, MGM and Lionsgate
• The format was developed to enable recording, rewriting and
playback of high-definition video (HD), as well as storing large
amounts of data.
2. The technology
• The name Blu-ray is derived from the blue-violet laser it uses to read and
write to the disc.
– The Blu-ray Disc system uses a laser operating at a wavelength of 405 nm to
read and write data. DVDs and CDs use red and infrared lasers at 650 nm
and 780 nm.
– Shorter wavelength enables
larger disc capasity.
2. The technology
• The BD standard places the data recording layer closer to the surface of the
disc, making the layer easier to damage.
– Special hard-coating created for the Blu-ray Disc
3. Blu-ray vs HD-DVD
Based on the same laser technology in slightly different ways.
3. Blu-ray vs HD-DVD
BD
Capasity:
AV transfer rate:
Movie studios: 7/8
50Gb
54Mbps
3/8
vs
30Gb
36.55Mbps
Blu-ray has bigger
hardware support.
2006).
HD-DVD
HD-DVD is more
cost effective (fall
4. Authoring on Blu-ray
• Video codecs:
– MPEG-2
– MPEG-4 AVC (aka H.264)
– SMPTE VC-1 (based on Windows Media Video)
• Audio codecs:
–
–
–
–
–
–
Linear PCM
Dolby Digital
Dolby Digital Plus
Dolby TrueHD
DTS Digital Surround
DTS-HD
- 8 channels, uncompressed
- 5.1-channel
- increased bitrates, 7.1-channel
- lossless, up to 8 channels
- 5.1-channel
- lossless, up to 8 channels
4. Authoring on Blu-ray
• Two authoring modes:
– HDMV (High Definition Movie)
– BD-J (Blu-ray Disc Java)
Both massively surpass the DVD specification in use today.
4.1 HDMV mode
HDMV has been designed to support a feature set that supersedes DVDVideo while emphasizing production continuity with existing media formats.
HDMV supports all of the well known DVD-Video features.
”Out-of-mux” reading:
While playing the movie the system can call up menus, overlay
graphics, pictures, button sounds, etc. at user request without
stopping
playback.
4.1 HDMV mode
Technology:
The HDMV decoder model is equipped with two read buffers, two
preloading buffers and two switches.
When you start to play a movie the main MPEG stream is sent to the primary
read buffer and the Out-of-Mux stream is sent to the secondary read buffer
by the switch.
The preloading buffers cache subtitles, interactive graphics and sound effects
data before movie playback begins and supplies data for presentation even
while the main MPEG stream is being decoded.
4.1 HDMV mode
This technology enables the following:
• Graphic planes
Two individual HD resolution graphics planes are available on top of the video
plane. One plane is assigned to video-related graphics (like subtitles) and the
other plane is assigned to interactive graphical elements such as buttons or
menus.
• Button graphics
Menu buttons support 256 color graphics and animation. Buttons can be
called and removed during video playback and there is no need to return to a
separate menu screen.
4.1 HDMV mode
• Button sounds
Loaded into memory of the player. When a user highlights or selects a menu
option the sound can be played (a button click or a voice-over explaining the
highlighted menu choice). These button sounds can even be mixed with the
running audio from the movie or menu.
• Multi-page menus
A menu can consist of several pages and users will be able to browse
through the menu pages, while the audio and video remain playing in the
background.
4.2 BD-J mode
BD-J, or Blu-ray Disc Java, is the interactive platform supporting advanced
content for Blu-ray Disc. BD-J mode was designed to offer the content
provider almost unlimited functionality when creating interactive titles. It is based
on Java 2 Micro Edition.
BD-J allows bonus content on BD titles to be far more sophisticated on
DVD. Like network access, picture-in-picture and access to local storage.
Having a full programming environment available on every Blu-ray Disc
player provides developers with an extremely flexible platform for creating
innovative new content types.
4.2 BD-J mode
Features:
• Graphical User Interface
The author has freedom in designing the user interface. It can display up to
32-bit dynamically generated graphics and it supports the display of pictures in
standard file formats like JPEG, PNG, etc.
• Playback control
The BD-J application can act as the sole interface to the disc's contents. The
BD-J environment offers all of the playback features of HDMV mode.
Video can be scaled dynamically so that it can be played in a small size in the
corner of a menu and resume full screen when a selection is made.
4.2 BD-J mode
• Storage
A Blu-ray Disc player can contain a small amount of non-volatile system
storage (flash memory). This system storage can be used to store
bookmarks, favorites from a disc, training course results, etc. A Blu-ray
Disc player may also be equipped with Local Storage (hard disk, to allow large
amounts of data like audio/video to be stored).
• Internet connection
The BD-J system supports basic internet protocols like TCP/IP and
HTTP . The player may connect to the disc publisher's web site to unlock
certain content on the disc or dynamically display certain info on the screen.
The disc's program may be extended with JPEG pictures or audio
fragments downloaded from the Internet, or it can even stream full new
audio/visual content to Local Storage.
5. Authoring software
• ”Blu-print” by Sony
– Released in August 2006
– $50 000 per license
• ”Scenarist” by Sonic
– $60 000 –> $100 000 per license
6. Conclusions
The next generation optical media battle is on going. Blu-ray seems to have the
upper hand but the next two years will tell which one wins.
The Blu-ray Disc format for movie distribution offers two profiles for the
creation of titles. It was designed to allow for the streamlined development of
Blu-ray Disc (HD) and DVD-Video (SD) titles at the same time, if needed.
Basic menus and navigation can be identical. It also offers many new
functions that will benefit the author by offering flexible ways of creating disc
content and the end users by offering new functionality compared to DVDVideo.
Questions?
Thank you!
Sources:
•
http://www.blu-ray.com/info/
•
http://www.blu-raydisc.com
•
http://en.wikipedia.org/wiki/Blu_ray#_note-1
