Wait months? For what? A domain transfer takes an hour. Change nameservers and you are done.Why months?You can use your ffmpeg version, but you need to change the ffmpeg command to something that works on an older one, however, I doubt the videos will fast start (for example).
Where do you register domains? I register with name.com (one of the biggest) and I can change nameservers 1000 times a day if I want.
registered it at my hoster