Ryzentosh Cant Export MP4 on High Sierra, but I can with Mojave

Hardware - Ryzen 9 3950x - Gigabyte Vega 64 OC - 128gb Corsair DDR4-3200 - Gigabyte Aorus Master X570. Followed Vanilla Ryzen guide. OpenCore. High Sierra on 1 SSD and Mojave on another.

The Issue (Other than this one thing, both systems work flawlessly)

High Sierra - When exporting to MP4 in iMovie/FCP, it immediately says the export failed. The issue does not exist in Mojave. Exporting to Apple's codecs is fine.

I need to be able to export to MP4 on High Sierra to finish a project. Please help!

submitted by /u/drjack6
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