Encoder comparison quality-speed tool

A dependency-free (pure standard-library) Python tool that loads the published rate-quality + speed dataset and, for every encoder configuration (implementation + preset), computes BD-rate versus the x264 medium ANCHOR, joins the encode speed (fps at 1080p), and finds the quality-speed PARETO FRONTIER — the configurations no other configuration beats on both speed and efficiency. Reproduces this article's headline table and frontier exactly. BD-rate uses the same engine as the 7.1 toolkit and 7.