How to Merge Multiple 4K Clips into One on Mac?

For Mac users who have exported two or more individually 4K clips from different editing software such as Final Cut Pro or Premiere Pro CC, you may wish to combine the two 4K clips into one single file. Although you can create a new project and put the two videos on the time line and then export but the export process could take hours. Or you may get two 4K files from a continuous shoot today, whe...
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