Here is the TL;DR for readers who want the command line now.
If you installed UserHEVC and it isn't working as the best codec, check these final two boxes: userhevc best
The tool is designed to work well with GPU-accelerated encoding, which speeds up the process significantly compared to CPU-only methods, though some users note a slight "perceptual" quality drop when using hardware acceleration for high-res sources. User Experience & Consensus Here is the TL;DR for readers who want the command line now
: The industry standard for 4K and 8K streaming. Here is the TL
: Reviewing existing subjective QoE models for multi-user video streaming. Quantization Parameter Estimation : Discussing