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Table Of Contents
The following video codecs are supported by the Blu-ray Disc specification:
n MPEG-2 is the venerable codec that we have worked with in standard DVD for over a decade. There
are many reliable MPEG-2 encoders that can output a compliant HD stream. The downside of
MPEG-2 is that it is not nearly as efficient as VC-1 or AVC, so it requires higher data rates (and
larger file sizes) to achieve similar quality results. Most of the initial Blu-ray Disc releases were
MPEG-2; however, very few new Blu-ray Disc titles use this codec.
n SMPTE VC-1 is a new standard that is based on the Windows Media 9 codec from Microsoft. VC-1
is more efficient than MPEG-2 and can achieve high quality results in the 15 Mbps range.
n MPEG-4 AVC is the newest of the three codecs and is the most advanced. It is also the favored
codec for Blu-ray Disc. AVC encoded streams can often achieve the same quality of MPEG-2 at one
half the data rate.
Subtitling
DoStudio Authoring supports graphics-based subtitles for Blu-ray Disc. The subtitle files are a series of 8-bit
PNGs with an accompanying XML file in .dost format. Several tools export .dost directly. For more
information, see "Subtitles" on page 57.
Authoring
After creating your graphics and encoding your video, you are ready to author your Blu-ray Disc.
Disc setup
Disc setup involves specifying the BDCMF formatting requirements, disc and organization IDs, and other
details. For more information, see "Disc Information" on page 33.
Menu creation
Professional Blu-ray Disc titles feature pop-up menus that can float over the video playing in the
background. In DoStudio Authoring, you import your menu element graphics and use actions to assign
navigation interactivity such as showing and hiding various menus and playback behaviors such as playing
or pausing a chapter. For more information, see "Importing menu graphics in Mosaic" on page 77"Using
actions" on page 101.
Playlist setup
Setting up your Blu-ray Disc playlist is not unlike setting up your title and chapter structure for a DVD. Using
DoStudio Authoring, you import your primary video and audio elements and assign them to a title. If your
title has chapter points, you enter those as timecode numbers. For more information, see "Playlists" on page
63.
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