I do my video editing on a Mac mini and the codec FCP X uses is h.264, but youtube(google) does no longer support this codec for 4K, but vp9. See the video:
Safari does support 4K VP9 and this how to enable it
Hello Greg,
I don't think you can upload a 4k video to facebook, HD is the max (for my groups in the Netherlands). So I upload to my youtube channel, choose share and copy the code to my facebook group. May be different in the United States.
Greetings,
Hans
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