Figured a fix out @TeamYouTube , needed to upload a slightly different video and it worked fine. Any re-uploads of the original just gets stuck at processing forever.
Hmm, video processing shouldn't take longer than a few hours at most (and may be longer for higher res formats). How long has yours been showing that it's still processing? Here's a few tips for videos stuck in upload too: https://yt.be/help/x21i