Apple has posted ProApps QuickTime Codecs for Mac OS X 10.5.6 or later and QuickTime 7.6 or higher.

This update adds the following video codecs for use by QuickTime-based applications: Apple Intermediate Codec; Apple ProRes; AVC-Intra; DVCPRO HD; HDV; XDCAM HD / EX / HD422; MPEG IMX; and Uncompressed 4:2:2. Apple says the update is recommended for all users of Final Cut Pro X, Motion 5, or Compressor 4.