Apple today released ProApps QuickTime Codecs v1.0.4 which 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
• Uncompressed 4:2:2

This update is recommended for all users of Final Cut Pro X, Motion 5, or Compressor 4.

More info and link to standalone installer here.