MPV 0.21.0 is a major update that adds a large amount of new features, options and commands, but also addresses dozens of bugs reported by users since the MPV 0.20.0 release, and introduces other minor enhancements. Among the most important new features, we can mention the ability to allow profile forward-references in the default profile, as well as support for Nvidia CUDA and cuvid/NvDecode, which appears to be a welcome addition to GNU/Linux distributions where HEVC Main 10 support is missing.