How to Transcode 4K XAVC S to 4K Prores for FCP X on Mac El Capitan?

Although FCP X does not support 4K XAVC S codec very well, however, it has no difficulty to ingest other video codecs such as H.264 or MPEG-4, especially the Apple Prores Codec, which is specially developed by Apple for high performance and high quality post-production editing in Final Cut Pro X. http://www.multipelife.com/transcode-4k-xavc-s-to-4k-prores.html