Apple Compressor 2 User Manual
Page 102
102
Chapter 7
Creating Dolby Digital Professional Output Files
Step 3:
Digitize the sound
Once your sound is mixed, save the resulting channels as sound files in one of these
formats:
 AIFF
 SoundDesigner II
 QuickTime
 WAVE
Depending on the format, a file can contain a single channel (mono), dual channels
(stereo), or multiple channels. Compressor supports Dolby Digital Professional in all
these configurations.
Sound files intended for Dolby Digital Professional encoding must conform to the
following rules:
 All source files should be the same length. (If they are not, Compressor sets the
length of the AC-3 stream to match the length of the longest file.)
 All files must have a 48 kHz sample rate (as required for DVD).
 AC-3 streams must have a multiple of 1536 samples. If the selected input files do not,
Compressor adds digital silence to the end of the files.
Note: Compressor 2 can support any kind of source files that contain surround sound
and high resolution audio up to 64 bits per sample (floating point) and sample rates up
to192 kHz.
Step 4:
Make channel assignments
Assign your source audio files to specific channels of the AC-3 stream. For more
information about channel assignments, see “
Assigning Files to Surround Sound
Assigning Files to Surround Sound Channels
Step 5:
Encode the sound files
Click Submit and Compressor does the rest, giving you an AC-3 audio stream.