A dependency-free (pure standard-library) Python tool that loads the published rate-quality dataset and computes the full BD-rate matrix — HEVC vs H.264, AV1 vs H.264, and AV1 vs HEVC — per content type and as an average, reproducing this article's headline table exactly. BD-rate is computed the way the research recommends: SHAPE-PRESERVING monotone PCHIP interpolation (no overshoot), integration in the LOG10-bitrate domain, integration ONLY over the overlapping quality range (IoU reported, thin
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