I'm still having this problem. Reported it. Hopefully there's a fix
coming. Preferable to remove the option to upload videos until it works
because it's wasting sellers precious time. Creating listings take
enough work already.
Videos are being uploaded but not passing review. After 48 hours it
comes back with 'unable to process' message. It's pretty frustrating.
Takes a bit of work to arrange and film a good video.