Here is what the flags in the command above actually do to your file:
VP9 works best using . The first pass analyzes the video complexity, and the second pass distributes the bits efficiently. young sheldon s02e17 libvpx
: Constant Rate Factor. This dictates quality. Here is what the flags in the command
Let me know which direction you need, and I'll give you the specific information or guide you need. young sheldon s02e17 libvpx