Extron Electronics JPEG 2000 Encoder - Manual (Page 35)

Audio Track Files
An audio track file is the smallest unit of audio in the system. It is an MXF container that has
all of the PCM-encoded, compressed audio data and associated meta-information necessary
to recreate a piece of audio (for example, see the a.mxf file shown in
figure 19 ). The
JMP 9600 supports frame-wrapped audio track files that conform to SMPTE 377M-2004 and
SMPTE 382M-2007 standards.
Reels
In the movie industry, it is common practice to split a feature onto several film reels for
distribution. This concept is supported digitally by splitting a feature into several separate
files. The digital reel is a track file (see “
Video Track Files ” and “ Audio Track Files ”) that
contains either video content or audio content. You may want to use multiple reels to create
more manageable file sizes such as hundreds of gigabytes rather than a few terabytes).
Composition Playlist
A composition playlist (CPL) is a text file that contains all of the information necessary to
reassemble a presentation from its individually encoded components and to specify how the
files for a specific presentation should be played back. The CPL file points to the reels (see
figure 20 ), identifying locations (folders) and filenames, and specifies the manner in which
the audio and subtitles are synchronized with the picture. The CPL can specify one video reel
and one audio reel or multiple reels of both types, depending on the wrapping process.
...
aud1.mxf vid1.mxf
aud2.mxf vid2.mxf
Composite
Playlist
audn.mxf vidn.mxf
Figure 20. Composite Playlist
Packing list and asset map
The packing list and asset map provide size and checksum information for audio and video
MXF files in the DCP so that the player can ensure no corruption occurred during the file
transfer. These files are described in SMPTE 429-8-2006 and SMPTE 429-9-2007 standards.
Encoding Related Specifications
z SMPTE 377M-2004 — Material Exchange Format (MXF) FIle Format
z SMPTE 422M-2006 — Mapping JPEG 2000 Codestreams into the MXF Generic
Container
z SMPTE 382M-2007 — Mapping AES3 and Broadcast Wave Audio into the MXF Generic
Container
z
SMPTE 429-3-2006 — D-Cinema Packaging - Sound and Picture Track FIle
z SMPTE 429-4-2006 — D-Cinema Packaging - MXF JPEG 2000 Application
z SMPTE 429-7-2006 — D-Cinema Packaging - Composition Playlist
z SMPTE 429-8-2006 — D-Cinema Packaging - Packet List
z
SMPTE 429-9-2007 — D-Cinema Packaging - Asset Mapping
JPEG 2000 Encoder • Reference 31