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support.apple.com]
Compressor 4.0.3 adds functionality and improves overall performance including:
Ability to run Compressor on a Mac without a monitor.
Fixes an issue with exporting when logged in as an Open Directory user.
Improves performance when encoding MP4 and AVI files.
Adds an export setting for 1080p video on compatible iOS devices.
For more information visit www.apple.com/finalcutpro/compressor.