Why? Because the encoder is effectively exploring every possible macroblock partition, reference frame, and motion vector across a huge temporal window. It’s the equivalent of solving a massive puzzle by hand instead of using a pattern-matching algorithm.
Allows users to target a specific visual fidelity rather than a rigid bitrate. superman libvpx
While modern codecs like AV1 (via libaom or SVT-AV1 ) are the new kings of efficiency, the legacy of "Superman" libvpx remains important. It taught us that raw codec potential is often locked behind software implementation. Optimized code can sometimes break the laws of the Rate-Distortion curve. the first pass gathers scene data
Recommended for maximum quality; the first pass gathers scene data, and the second pass executes the compression. superman libvpx