Can’t export MP4 videos from replay editor. (PC)

Last week the game would crash when attempting to export MP4s, this week I get the 321 countdown which transitions directly into the pop up saying the video was saved to my local disk (after the count down the game never plays the clip during the export procedure) despite there being NO video saved in my local disk. MP4 files were exporting fine up until the 7 ply event update hit the game.

webm files work normally, but they export at a very low resolution, as well as at about 75-80% speed.

have reset graphics drivers, repaired game files, deleted/reinstalled game, and updated motherboard bios with NO luck. Have also tried exporting on an ROG Ally X but have the same issue. 

exporting clips is the main thing bringing me back to this game, please fix this asap.