To follow this recipe, you will need a humanoid character ready to be rigged to a proper Unity Humanoid rig. We also need a motion capture animation. You can find a huge free-to-use library of motion capture data on the Carnegie Mellon University's website at http://mocap.cs.cmu.edu/. We are going to use the 01_01.bvh file in this example.

You can also download the example Unity project provided and go to the Chapter 10 MiscellaneousRecipe 04 Preparing motion capture files for humanoid characters directory. You can find the Example.unity scene there. If you play the game, you will see a character playing a retargeted motion capture animation. You can find the BVH file in the Raw data directory. The final FBX file is in the Final FBX directory, and all the blend files are located in the Blend Files directory.