Use Constant Quality (CRF).
Example Command Used:
Here is a deep dive into why Season 8 is a pivotal moment for the series and why the libvpx (VP9) codec is the gold standard for archiving it. The Renaissance of Friends: Why Season 8 Matters friends season 08 libvpx
# Pass 1 ffmpeg -i input.mkv -c:v libvpx-vp9 -b:v 1200k -pass 1 -speed 4 -an -f null /dev/null Use Constant Quality (CRF)