VP9/libvpx is (YouTube uses it) but problematic for :
It looks like you’re referring to and the libvpx video codec—likely because you have a file named something like The.Penguin.S01E03.1080p.WEB-DL.libvpx.mkv or are trying to encode/decode it.
: Directed by Craig Zobel and written by Noelle Valdivia . Understanding "libvpx"
You can remux or convert:
"The Penguin" is likely a series related to the DC Comics character Oswald Cobblepot, also known as the Penguin, a notorious villain in the Batman series. This character has been portrayed by various actors over the years, including Burgess Meredith, Danny DeVito, and Colin Farrell.