rav1e
The fastest and safest AV1 encoder
...This makes rav1e particularly attractive for scenarios where you need AV1 encoding but care about build-time, portability, and maintenance overhead, or where the full-featured reference encoder might be prohibitively slow. Despite aiming for simplicity, rav1e supports a wide range of AV1 features: different bit depths, chroma subsampling formats, prediction and transform modes, and block partitioning options, which means it can produce reasonably efficient compressed video.