When you see "libvpx" in a file description for Rick and Morty Season 6, it indicates that the episodes have been encoded using these tools. Compared to the older x264 standard, libvpx (especially using VP9) can save between while maintaining the same visual quality. Rick and Morty Season 6: A Quick Refresher
: Widely used for web-based video, notably in the early days of HTML5. rick and morty s06 libvpx