Apple Compressor (4.0) - Manual (Page 81)

Chapter 5 Custom settings and output formats 81
Bitstream tab
These settings are stored in the finished stream for use by the playback device. Leave them at
their default values unless you have a specific technical reason for changing them.
•
Center Downmix, Surround Downmix: If your encoded audio has these channels, but the player
does not, the channels are mixed into the stereo output at the specified level.
•
Dolby Surround Mode: When encoding in 2/0 (stereo) mode, this setting specifies whether the
signal uses Dolby Surround (Pro Logic).
•
Copyright Exists: Select this checkbox to specify that a copyright exists for this audio.
•
Content is Original: Select this checkbox to specify that this audio is from the original source
and not a copy.
•
Audio Production Information: Select this checkbox and fill in the fields below to specify how
the encoded audio content was mixed. Playback devices may use this information to adjust
output settings.
•
Peak Mixing Level: Specifies peak sound pressure level (SPL) (between 80 dB and 111 dB) in
the production environment when this mix was mastered.
•
Room Type: Specifies information about the mixing studio.
Preprocessing tab
Preprocessing options are applied to the audio data before encoding. With the exception of the
Compression Preset setting, leave these settings at their default values unless you have a specific
technical reason for changing them.